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We present the description of a new genus and new species of praying mantis, Hondurantemna chespiritoi gen. n. & sp. n. This species of cryptic mantis, collected in National parks in Mexico and Honduras, remained unknown despite its considerable body size. Based on a phylogenetic analysis with molecular data and traditional morphological analysis, we place this new genus within Antemninae, a monotypic Mantidae subfamily. We update the subfamily concept for Antemninae and provide a key to the two genera. We describe the external morphology of immatures and adults of the new species as well as the genital complexes of both sexes and the ootheca of Antemna rapax. The observed morphological changes between immature and adult females suggests that the selection for an alternate strategy for crypsis is a response to size increase of the abdomen during development. Immatures exploit a stick/branch habitat based on their morphological appearance while adult females appear as a leaf to disguise the profile of the body.
Se presenta la descripción de un nuevo género y una nueva especie de mantis religiosa, Hondurantemna chespiritoi gen. n. & sp. n. Esta nueva especie de mantis críptica, colectada en ciertos parques nacionales de México y Honduras, había permanecido hasta ahora desconocida para la ciencia a pesar de su gran tamaño corporal. Utilizando un análisis filogenético con datos moleculares y junto con análisis tradicional de morfología, se logró clasificar a este nuevo género dentro de la subfamilia monotípica Antemninae que pertenece a la familia Mantidae. Como resultado se actualiza el concepto taxonómico de Antemninae y se presenta una clave para identificar los dos géneros atribuidos a esta subfamilia. Se describe la morfología externa de los juveniles y adultos de la nueva especie, así como el complejo genital de ambos sexos y la ooteca de Antemna rapax. La diferencia morfológica observada entre juveniles y adultos sugiere que existen fuerzas selectivas divergentes, posiblemente en respuesta al aumento del tamaño del abdomen durante el desarrollo, para así mantener su camuflaje a lo largo de su ciclo de vida. Sobre la base de su apariencia general, los juveniles utilizarían una estrategia críptica asemejando ramas, mientras que las hembras adultas asemejan hojas verdes para ocultar el contorno corporal.
The taxonomy of Mantodea has been revised several times during the 20th century, leading to unstable family and subfamily arrangements (Giglio-Tos 1927, Beier 1964, Terra 1995). Ehrmann and Roy (Ehrmann 2002) proposed the most recent classification of the order, which greatly improved the classification proposed by Beier (1964), although some problems remained. Svenson and Whiting (2004, 2009) conducted molecular phylogenetic analyses and found evidence that around half of the families and subfamilies were not monophyletic, concluding that patterns of convergent morphology mislead taxonomists into creating artificial groups. Their findings indicated the need of revisionary work at almost all levels of Mantodea systematics to better understand the diversity and create a natural classification. In phylogenetic studies, most Neotropical mantises are recovered in two major clades (Yager and Svenson 2008, Svenson and Whiting 2009). The first clade is comprised of the primitively deaf species, the Acanthopoidea (recently revised by Rivera and Svenson 2016), diverging early in the evolution of the group while the second clade diverged much later and includes almost all Neotropical species within Mantidae (Svenson and Whiting 2009). Finally, Rivera (2010b) reviewed the state of the systematics of Neotropical genera and highlighted several groups that needed revision, including all Mantidae subfamilies, calling for increased studies on the diversity and taxonomy of the group.
Two enigmatic praying mantis specimens, one male and one female, were discovered in collections from the United States and France. Shared characteristics of the two specimens suggested they were conspecific, but they were incompatible with the descriptions of known Neotropical genera. Additional material collected in Honduras, including two adult females and nymphs of both sexes, confirmed the conspecificity of the specimens and provided the opportunity to study some morphological variation. Initial examination of other Neotropical taxa allied our unknown specimens with Antemna rapax Stål, 1877, the only representative of Antemninae. In both species, mid- and hindlegs present a posteroventral sub-apical lobe on the femora; males have a medial ocellar process; and the shape of the forewing of the females is similar, with an enlarged costal area, which is unusual for Neotropical species. No other Neotropical genus included with the Acanthopoidea sensu Rivera and Svenson (2016), Vatinae sensu Svenson et al. (2016), Stagmomantinae - Stagmatopterinae - Choeradodinae sensu Ehrmann and Roy (Ehrmann 2002) demonstrated enough similarity to suggest close relation. However, the high level of morphological convergence in the order (Svenson and Whiting 2009) prevented a definitive placement of the new lineage in the absence of a phylogenetic analysis. The description of immatures of this new species also presents an opportunity to shed new light on an often-neglected aspect of praying mantis natural history: ontogenetic changes in morphological traits associated with camouflage and mimicry.
Ontogenetic studies on Mantodea are uncommon and most species are described based on adult specimens, while nymphs remain unknown or undescribed, with a few exceptions. Heitzmann-Fontenelle (1969) revised Cardioptera Burmeister, 1838 and described the nymphal stages of two species of the genus while Terra (1980) studied the development of raptorial forelegs in four species of Neotropical mantises. Avendaño and Sarmiento (2011) did the most complete work by characterizing morphological changes during the post-embryonic development of Callibia diana Stål, 1877 while collecting data to characterize allometric growth. However, these works dealt with cases where the morphology of immatures and adults were similar enough that matching life stages was not difficult. Wieland (2013) reviewed Mantodea post-embryonic development of different body parts and recent studies have revealed a number of cases across Mantodea where nymphal strategy and appearance differ from adults. For instance, nymphs of Acontista Saussure & Zehntner, 1894 (Acontistidae) have been reported to resemble ants both in overall shape and in behavior, a strategy not seen in adults (Salazar 2003). The Amazonian Mantillica nigricans Westwood, 1889 (Thespidae, Bantiinae) was recently reported to also exhibit ant-mimicry, a strategy observed in nymphs of both sexes as well as adult females, but not in adult males (Agudelo and Rafael 2014). Immature males of the lichen-mimic Pseudopogonogaster kanjaris Rivera & Yagui, 2011 (Thespidae, Pseudopogonogastrinae) exhibit cuticular, lichen-like lobes on the abdominal terga similar to those observed in adult females, but in the adult stage these become reduced and tucked under the well-developed wings (Rivera et al. 2011).
Morphological sexual dimorphism, frequently present in Mantodea species (Hurd 1999), can be reflected during development as considerable changes occurring between instars. In cases of moderate to extreme dimorphism, males, females and nymphs have been described as separate genera due to discrepant morphologies, e.g. Antemna Stål, 1877, Phyllomantis Saussure, 1892 and Neacromantis Beier, 1931 (Rehn 1935), Pseudopogonogaster Beier, 1942 and Calopteromantis Terra, 1982 (Rivera et al. 2011), and Pachymantis Saussure, 1871 and Triaenocorypha Wood-Mason, 1890 (Svenson et al. 2015). Careful study including adults and immatures can prevent life stages being described as separate taxa or resolve instances where that happened. Studies tracking changes during post-embryonic development not only add descriptive knowledge (e.g. Heitzmann-Fontenelle 1969, Avendaño and Sarmiento 2011) they can also reveal different life strategies between immatures and adults (e.g. Salazar 2003) and shifts between male and female ecologies.
Herein, we leverage a molecular based phylogeny paired with traditional comparative morphology to place our unknown taxon among other Neotropical praying mantises. We 1) place our unknown taxon in a newly created genus allied with Antemna within Antemninae; 2) provide a diagnosis for the new genus and an extensive description of the new species, high-resolution images and morphological illustrations; and 3) describe morphological changes occurring through post-embryonic development with comments on the ecological significance and present the distribution for the new species.
We examined twenty specimens of the new taxon, one male genitalia and one ootheca of Antemna rapax. Specimens are accessioned in four collections: the Muséum National d’Histoire Naturelle (MNHN) Paris, France, the California Academy of Sciences (CAS) San Francisco, USA, the Academy of Natural Sciences of Drexel University (ANSP) and the Cleveland Museum of Natural History (CLEV) Cleveland, USA.
We examined specimens using a Leica M80 stereomicroscope and measured them with a Leica M165C stereomicroscope fitted with an IC80 HD coaxial video camera and the live measurement mode of the Leica Application Suite (LAS). Measurements are given in millimeters and include: body length (measured from the frons to the apex of the abdomen); prozona length (measured from the anterior end of the prothorax to the sulcus above the supracoxal dilation); metazona length (measured from the sulcus above the supracoxal dilation to the posterior end of the prothorax); prothorax width (measured at the level of the supracoxal dilation); forewing length (measured from the point where the forewing articulates with the thorax to the tip); hindwing length (measured from the point where the hindwing articulates with the thorax to the tip); forecoxa length (measured from the articulation with the prothorax to the articulation with the trochanter); forecoxa width (measured at the widest point of the coxa); forefemur length (measured from the articulation with the trochanter to the articulation with the tibia); forefemur width (measured at the widest point of the femur); foretibia length (measured from the articulation with the femur to the articulation with the tarsus); mesofemur length (measured from the articulation with the trochanter to the articulation with the tibia); metafemur length (measured from the articulation with the trochanter to the articulation with the tibia). We calculated ratios useful for species identification (Svenson 2014, Rodrigues and Cancello 2016) for the new species: metazona length/prozona length; pronotum length/width; pronotum length/forecoxa length; forefemur length/width. We give spine count for forelegs according to the spination formula proposed by Rivera (2010a) and modified by Brannoch and Svenson (2016), e.g. F= 3DS/10AvS/4PvS; T=12AvS/15PvS where F is forefemur, T is foretibia, DS is discoidal spines, AvS is anteroventral spines and PvS is posteroventral spines. All spines are numbered from the base of the segment to the apex. We extracted male and female genital complexes from the abdomen and treated them in a heated weak KOH solution for 5 minutes to dissolve soft tissues (Rodrigues and Cancello 2016). Treated genital structures were either placed inside vials filled with glycerin and pinned with the specimen or placed with the specimen inside an ethanol-filled vial. Nomenclature of genital structures follows Klass (1997, 1998). Morphological features of the adult female and nymphs that are identical in the males were omitted from the description to avoid redundancy.
We took high resolution photos with a Passport Storm© system (Visionary Digital™, 2012), which included a Stackshot z-stepper, a Canon 5D SLR, macro lenses (50mm, 100mm and MP-E 65mm), three Speedlight 580EX II flash units with initial image processing done on Adobe Lightroom 3.6. Z-stepper was controlled using Zerene stacker 1.04, and images stacked with P-Max protocol. Photos were edited using Adobe Photoshop CC to correct for background noise and to add scale bars. We created illustrations with Adobe Illustrator CC based on high-resolution photos of the structures. We constructed plates with Adobe Illustrator CC.
We conducted phylogenetic analyses to test the position of our new taxon using molecular data. The ingroup sample included taxa within Antemninae, Stagmatopterinae, Stagmomantinae, and Vatinae (Table (Table1),1), which provided coverage across the four major lineages of Neotropical Mantidae. Representative outgroup taxa were included to test the position of our new taxon relative to Acanthopoidea (Rivera and Svenson 2016) and African and Asian taxa recovered in close relation to our ingroup (Svenson and Whiting 2009). Representatives of Chaeteessidae and Mantoididae were included to root the phylogeny based on their consistent recovery as the two earliest branches of Mantodea (Svenson and Whiting 2009, Wieland 2013, Svenson et al. 2015). We assembled a molecular dataset from previously published works (Svenson and Whiting 2004, 2009, Svenson et al. 2016) and newly generated sequence data (see Table Table11 for GenBank accession numbers). The molecular dataset included four genes: the mitochondrial cytochrome oxidase I (COI) and NADH dehydrogenase subunit 4 (ND4) and the nuclear Histone subunits 2 and 3 (H2A and H3). Lab protocols for extraction, amplification, and sequencing followed published procedures (Svenson and Whiting 2004, 2009, Svenson et al. 2015). New sequence data was imported, verified, and aligned along with published data using Geneious alignment on Geneious v7.1.4. The resulting alignment included 3512 characters. We determined the best fit models for each gene using the Akaike Information Criterion implemented in MEGA v.7 (Kumar et al. 2015): GTR+Ɣ+I for COI, T92+Ɣ for ND4, HKY+Ɣ for H2A and T92+I for H3. We conducted four independent mixed model Bayesian inference (BI) using MrBayes ver. 3.2.5 (Altekar et al. 2004, Ronquist et al. 2012). For all BI, each run was started from a random tree. All sampled generations (every 1000) prior to stationarity were discarded (burn-in). The trees sampled from the stationary distribution were summarized as a 50% majority rule consensus tree to find posterior probabilities (PP) (Huelsenbeck and Imennov 2002, Huelsenbeck et al. 2002). We also performed partitioned maximum likelihood (ML) analysis using RAxML v8 (Stamatakis 2014). Nucleotide substitution parameters were estimated independently from each data partition. One thousand nonparametric bootstrap (BS) pseudoreplicates were performed under a GTR model with CAT approximation of Gamma-distributed among-site rate heterogeneity. Every fifth BS tree was used as a starting tree for more thorough optimization of the real data under GTR+Gamma. FigTree v1.4.2 (Rambaut 2012) was used to visualize topologies and produce figures for both ML and Bayesian analyses.
The results of BI and ML analyses were largely congruent and generally well supported (Fig. (Fig.1).1). The partitioned ML analysis recovered a topology (likelihood score: -22681.630120) with a moderate BS value (83) resolving our new taxon as sister to Antemna within a clade including one Stagmomantis Saussure, 1869 taxon (Fig. (Fig.1).1). However, BS values within (Stagmomantis 1 + Antemna + the new taxon) indicate taxon relationships within the clade and with other Stagmomantis taxa may be unstable. The BI (harmonic mean: -22653.69) also recovered our new taxon as sister to Antemna with high PP, with the remainder of the topology in almost complete congruence with the ML topology. PP for nodes within the (Stagmomantis 1 + Antemna + the new taxon) clade firmly place the new taxon within this lineage (Fig. (Fig.1).1). We recovered Stagmomantis 1 as sister to the new genus plus Antemna in both analyses rather than sister to other Stagmomantis taxa, indicating a paraphyletic Stagmomantis.
The phylogenetic analyses recovered the new taxon as closely related to Antemna rapax (Fig. (Fig.1).1). This result corroborates our initial hypothesis based on morphological observations and supports inclusion of the new taxon within Antemninae. Terra (1995) created the subfamily Antemninae to accommodate only the type-genus Antemna. With the description of a new genus within Antemninae, we update the concept of the subfamily to reflect its new composition. We also present the first photos of the male genitalia of Antemna rapax (see below) (Figs (Figs20,20, ,2121).
Antemna Stål, 1877.
Males have a medial ocellar process that originates posteriorly to the ocelli but anterior to the postfrontal sulcus. The dorsal margin of the forefemora at least partially produced, forming a lamellar projection. Forefemora with four discoidal spines. Meso- and metathoracic legs bearing a posteroventral sub-apical lobe originating from an expansion of the keel running along the margin of the femur. Abdomen of the females swollen, almost as wide as long.
|1||Five posteroventral forefemoral spines. Dorsal expansion of forefemur extending to femoral apex (Fig. (Fig.7).7). Forewing of females with a spot on the center of the discoidal area. Apofisi falloide of male genitalia with the anterior apex recurved dorsally (Fig. (Fig.12).12). Processo ventrale of the right phallomere longer than wide (Fig. (Fig.1313)||Hondurantemna gen. n.|
|–||Four posteroventral forefemoral spines. Dorsal expansion of forefemur ending abruptly before femoral apex (Fig. (Fig.19).19). Forewing of females with a spot on the border of the discoidal and costal areas. Apofisi falloide of male genitalia with the anterior apex not recurved dorsally (Fig. (Fig.20).20). Processo ventrale of the right phallomere wider than long (Fig. (Fig.2121)||Antemna|
Hondurantemna chespiritoi sp. n. by monotypy
Rounded compound eyes, nymphs and adult males have a medial ocellar process, subadult and adult females without the process. Forelegs with five posteroventral spines and four discoidal spines. Mid- and hindlegs with a single small lobe near the apex of the femur. Male’s forewings are hyaline with green crossveins, forewings of females with a spot close to the center of the discoidal area.
The generic epithet combines the words Honduras, country were the majority of specimens we studied were collected, and Antemna, in reference to the morphological similarities of both Antemninae genera.
Holotype. 1 ♂ Mexico, Chiapas, Municipio de La Trinitaria, Lagunas de Monte Bello National Park, bellow Dos Lagos on rd. to Santa Elena, 1219m, 14.x.1981, D.E. & P.M. Breedlove (CAS). Allotype. 1 ♀ Honduras, Cortes 18km O. San Pedro Sula, Cra. El Merendon, 1650m, vii.1995, T. Porion A. Grange (MNHN). Paratypes. Adults: 1♀ Honduras, Cortez, San Pedro Sula, Cusuco National Park, Base Camp, 15.4964 -88.2119, 27.vii.2015, N. Reid col. GD0073, MN758; 1♀ Honduras, Cortez, San Pedro Sula, Cusuco National Park, Base Camp, 15.4964 -88.2119, 31.vii.2015, N. Reid col. GD0072. Immatures: 1♀ Honduras, Cortez, San Pedro Sula, Cusuco National Park, Santo Tomas, 15.5611 -88.2974, 21.vii.2015, N. Reid col.; 1♂ Honduras, Cortez, San Pedro Sula, Capuca, 15.5031 -88.2222, 17.vi.2015, N. Reid col.; 1♂ 6♀ Honduras, Cortez, San Pedro Sula, Cusuco National Park, Base Camp, low vegetation, 15.4964 -88.2119, 09.vi.2015, N. Reid col.; 1♂ Honduras, Cortez, San Pedro Sula, Cusuco National Park, Base Camp, low vegetation, 15.4964 -88.2119, 09.vi.2015, N. Reid col., MN757; 2♀ Honduras, Cortez, San Pedro Sula, Cusuco National Park, Base Camp, 15.4964 -88.2119, 17.vi.2015, N. Reid col.; 1♀Honduras, Cortez, San Pedro Sula, Cusuco National Park, Base Camp, 15.4964 -88.2119, 17.vi.2015, N. Reid col., MN759; 1♀ Honduras, Cortez, San Pedro Sula, Cusuco National Park, Base Camp, 15.4964 -88.2119, 26.vii.2015, N. Reid col.; 2♀ Honduras, Cortez, San Pedro Sula, Cusuco National Park, Base Camp, 15.4964 -88.2119, vi–vii.2015, N. Reid col. (all paratypes are accessioned at CLEV).
Male: Medium sized. General coloration light brown with dark brown spots (Fig. 2A, B). Body length: 34.2; prozona length: 2.9; metazona length: 5.9; prothorax width: 3.8; forewing length: 21.9; hindwing length: 18.1; forecoxa length: 7.2; forecoxa width: 1.9; forefemur length: 8.8; forefemur width: 2.4; foretibia length: 5.0; mesofemur length: 12.0; midleg metatarsus length: 1.8; metafemur length: 15.3; hindleg metatarsus length: 2.5; metazona length/prozona length: 2.0; pronotum length/width: 2.3; pronotum length/forecoxa length: 1.2; forefemur length/width: 3.6.
Head (Fig. (Fig.3A):3A): Rounded eyes. Vertex with dark brown spots, straight, on the same level as the imaginary line connecting the dorsal margin of compound eyes, and separated from the ocelli by two lateral keels and a central depression, the latter bearing the medial ocellar process with a rounded apex. Juxtaocular bulges not developed, on the same level as the vertex. Ocelli medium sized, arranged in the shape of a “V”, with the two lateral ocelli further away from each other due to the central depression. Scape and pedicel light brown, flagellomeres of antennae filiform, dark brown. One small tubercle between the eye and the antennal socket. Lower frons subpentagonal, almost as high as wide, bearing two small tubercles, upper margin arcuate, sinuous, the apex straight. Clypeus with a vertical central keel on the lower half. Maxillary palps with black spots on the medial surface, progressively larger towards the apical segments. Labial palps black on the medial surface of all segments.
Thorax (Fig. (Fig.4A):4A): General shape cruciform, with the supracoxal dilation pronounced and rounded, metazona two times longer than the prozona. Margins of the prozona convergent anteriorly, ciliated, posteriorly slightly expanded, produced as flat projections, herein called shelves. Margins of the metazona also slightly produced in shelves, ciliated, with small tubercles, almost all of which are black, the anterior part of the metazona with symmetrical depressions on the dorsal surface. Cervix framed by lateral and intercervical sclerites, two ventral sclerites present; the intercervical sclerites with a pronounced torus intercervicalis, the first ventral cervical sclerite constricted in the middle (Fig. (Fig.5).5). Metathoracic hearing organ with deep groove, without knobs (DNK type) (see Yager and Svenson, 2008).
Prothoracic legs: Forecoxae (Fig. (Fig.6A)6A) triangular in cross-section, light brown except for the dorsal apical lobe, which is dark brown; posteroventral margin with dispersed tubercles, anteroventral margin with small tubercles bearing slender setae, dorsal margin bearing five large spines and smaller spines between them, the former dark brown on the posterior surface and black on the anterior surface and around the base; anterior apical lobes divergent. Forefemora (Fig. (Fig.7A)7A) light brown with three dark brown spots on the dorsal area of the anterior surface, dorsal margin regularly convex, slightly compressed anteroposteriorly; F=4DS/15AvS/5PvS; crenulation between posteroventral spines II, III and IV; all discoidal spines black on the anterior surface, the first spine with a dark spot on its base; all the large anteroventral spines black on the inner surface with a dark spot on their bases, a dark spot on the anterior surface above the first two spines; genicular spine developed on both sides of the femora; spur sulcus located in the proximal quarter of the femora; femoral brush extending from the 13th anteroventral spine to beyond the most distal. Foretibiae (Fig. (Fig.8A)8A) light brown; T= 12–13AvS/12–13PvS. Foretarsi light brown, with an anterior-basal dark brown spot on the first tarsomere and dark brown anterior-apical spots on tarsomeres I–III.
Wings: Forewings reaching the apex of the abdomen, costal area with a sinuous margin, reticulate veins, opaque green; discoidal area mostly hyaline, with an anterior area smoky green and all the veins and crossveins opaque green. Hindwings shorter than the forewings, not reaching the apex of the abdomen; hyaline with brown-red veins and crossveins (Fig. 2A, B).
Meso- and metathoracic legs: Coxa with two strong keels, one anterodorsal and the other posterodorsal. Trochanter with a notch on apical ventral margin, bearing a spine on the articulation with the femora (Fig. (Fig.9).9). Femora smooth except for one keel that runs along the posteroventral margin and originates one single subapical lobe (Fig. 10A); one genicular spine present on the anterior surface. Tibiae smooth, circular in cross-section with two genicular spines. Tarsi with metatarsomeres shorter than other tarsomeres together.
Abdomen: With black spots on the sides of tergites II–V and VII–IX, and a black stripe on tergites VI–VII. Slightly dorsoventrally compressed, with apical lobes on sternites IV–VI, more developed on segments V and VI, the lobes flat against the body (Fig. (Fig.11).11). Supra-anal plate triangular, wider than long, posterior margin arcuate. Cerci elongated but not reaching the apex of subgenital plate, the latter almost as wide as long, flat between styli.
Genitalia: Left phallomere – Sclerite L4B roughly rectangular, longer than wide, left margin projected anteriorly; apofisi falloide (afa) with the anterior part bearing small spines and extremely elongate, projecting dorso-posteriorly, posterior part also elongated, curved towards the left, tapering distally and bearing small spines at the apex; lobo membranoso (loa) elongate, without projections, glabrous; processo apical (paa) elongate, slightly flattened, curved 30° to the left, apex curved anteriorly; sclerite L4A roughly circular, without projections other than the processo distal (pda); pda elongate, curved to the right, uniformly broad, tapering at the distal third, ending in a strongly sclerotized spine (Fig. (Fig.12).12). Right phallomere – roughly triangular, rounded posterior apex; right arm elongate, slender, without projections; anterior process elongate and slender; apodema anterior (aa) oval and slender; processo ventrale (pva) elongate, smooth, apex rounded and well sclerotized; piastra ventrale (pia) elongate, well sclerotized, with “U” shaped striations (Fig. (Fig.1313).
Female: Medium to large sized. General coloration light green without any spots (Fig. (Fig.2C,2C, ,2D).2D). Body length: 52.9–53.9; prozona length: 5.1–5.5; metazona length: 10.8–11.2; prothorax width: 6.7–7.0; forewing length: 29.4–31.6; hindwing length: 31.6–31.9; forecoxa length: 12.7–14.0; forecoxa width: 3.0–3.9; forefemur length: 15.6–16.0; forefemur width: 4.3–4.6; foretibia length: 8.5–8.9; mesofemur length: 12.0–12.4; metafemur: length 15.3–15.8; metazona length/prozona length: 2.0–2.1; pronotum length/width: 2.4–2.5 pronotum length/forecoxa length: 1.2–1.3; forefemur length/width: 3.4–3.6.
Head (Fig. (Fig.3B):3B): Vertex straight or slightly sinuous, raised above imaginary line connecting dorsal margins of the eyes, juxtaocular bulges slightly developed. Ocelli small, arranged in the shape of an arc. Scape, pedicel and first half of the flagellomeres of the antennae green, the second half of the flagellomeres dark brown. Lower frons bearing two small central tubercles, except in one of the specimens. Maxillary palps green, the last segment with black spot on the medial surface.
Thorax (Fig. (Fig.4B):4B): Supracoxal dilation pronounced and rounded. Margins of the prozona convergent, ciliated with small tubercles, produced in shelves. The posterior third of the metazona with a central keel. The first ventral cervical sclerite in one of the specimens constricted in the middle, in the other two specimens not constricted.
Prothoracic legs: Forecoxae (Fig. (Fig.6B)6B) green, dorsal margin bearing six to eight large spines, dark brown on the anterior surface and around the base, apical lobes parallel. Forefemora (Fig. (Fig.7B)7B) green, dorsal margin bearing small tubercles, regularly convex, slightly compressed anteroposteriorly; F=4DS/15AvS/5PvS; posteroventral spines with crenulation present after the second spine; the first discoidal spine black on the anterior surface, the other three dark brown; the first anteroventral spine and all the large anteroventral spines dark brown on the anterior surface, the large spines may present a dark spot on their base. Foretibiae (Fig. (Fig.8B)8B) green; T= 14AvS/13–14PvS. Foretarsi green, without dark spots.
Wings: Forewings opaque green, costal area almost as wide as the discoidal area, the apex constricted, making the tegmina follow the abdomen contour, with 7–10 branches of the sub-costa vein, crossveins with a reticulate appearance; spot in the center of the discoidal area, composed of an anterior small crescent-shaped brown portion and a posterior round white portion; anal area smoky green. Hindwings as long as the tegmina, reaching the apex of the abdomen, apex of the discoidal area well developed, opaque green, the remainder of the hindwing hyaline (Fig. 2C, D).
Meso- and metathoracic legs: Femora with three keels, one runs along the posteroventral margin and originates one single subapical lobe (Fig. 10B), the second runs along the dorsoposterior margin and the third, less marked, runs along the dorsoanterior margin. Tibiae with two rows of aligned setae. Metatarsi with the metatarsomeres equal or slightly smaller than the other tarsomeres together.
Abdomen: Without black spots. Slightly dorsoventrally compressed, without apical lobes on sternites. Cerci elongated, cercomeres cylindrical, except the last one, which is conical.
Genitalia: Gonoplacs (gl) simple, bearing setae along the dorsal margin and the base, apex bearing a ventral projection. Gonapophysis IX (gp) mostly membranous, with two sclerotized ribbons, one elongate and tapering towards the apex of gp, the other shorter and occupying a medial projection of gp, this projection being rounded; gl and gp of almost the same length. Gonapophysis VIII (ga) bearing setae on the base, on the ventral surface and on the apex, a dorsal groove spanning the two basal thirds, ending in a pointed projection, the apex enlarged ventrally. Basivalvula (bv) with the lateral surface smooth, bearing a central depression, the medial surface rugose, with two projections, one central directed medially, the other more posterior, directed to the base of the ga. Interbasivalvula (ib) well sclerotized, rugose and shaped like a sectioned rhombus. Laterosternal shelves (ls) weakly sclerotized, roughly rhomboid, with short rounded posterior projections (Fig. (Fig.1414).
Nymphs (unless specified, description applies to male and female nymphs of all instars): General coloration varies from entirely light brown to light brown mottled with dark brown.
Head: Vertex higher than imaginary line connecting dorsal margin of the compound eyes, without lateral keels and a central depression but with the medial ocellar process. In female nymphs, the process becomes increasingly smaller during development, being absent on the instar before the final molt (Fig. (Fig.15).15). Juxtaocular bulges slightly developed. Ocelli small, underdeveloped. Lower frons mottled dark brown to completely light brown, with the upper margin not sinuous, tubercles light brown. Clypeus with a transversal keel on the middle, light brown or with the upper half mottled dark brown and the lower half light brown. Maxillary palps with segments I and II black on the medial surface, IV light brown to light brown with a dark brown spot, segment V light brown to completely dark brown. Labial palps segments black on the medial surface or completely dark brown.
Thorax: The first ventral cervical sclerite may be split in two. Metathoracic hearing organ underdeveloped.
Prothoracic legs: Forecoxae light brown except for the lower apical lobe, which is dark brown. Dorsal margin bearing five to six large spines. Forefemora varying, light brown with three dark brown spots on the dorsal area of the anterior surface to dark brown with light brown spots; F=4DS/15AvS/5PvS; males without crenulation between posteroventral spines, females with crenulation; discoidal spines black on the anterior surface, the first spine presenting a dark spot on its base; the first anteroventral spine black, a dark spot on the anterior surface above the first two to four spines; femoral brush extending from the 12th anteroventral spine to the last, a dark spot may be present under the femoral brush. T=13–14AvS/12–14PvS. Foretarsi with an anterior-basal dark brown spot on the first tarsomere and dark brown anterior-apical spots on all tarsomeres.
Meso- and metathoracic legs: Femora with three keels, one runs along the posteroventral margin and originates one single subapical lobe, the second runs along the dorsoposterior margin and the third, less marked, runs along the dorsoanterior margin, the keels on the youngest female nymphs are expanded into shelves (Fig. 16A). Metatarsi with the metatarsomeres equal or slightly smaller than the other tarsomeres together.
Abdomen: Without black spots or bands on the tergites. Not dorsoventrally compressed, on males apical lobes present on sternites IV–VI, lobe on segment V more developed, the lobes pointing down instead of being held against the body (Fig. (Fig.17),17), on females, lobes absent. Supra-anal plate triangular, almost as long as wide, posterior margin arcuate. Cerci short, styli developed on males, absent on females.
The Lagunas de Montebello National Park, Mexico, from which the holotype was collected, is ca. 6,500 hectares located on the high plains of Chiapas, with an altitude between 1,200 and 1,800 meters above sea level (UNESCO: Lagunas de Montebello http://www.unesco.org/mabdb/br/brdir/directory/biores.asp?mode=gen&code=MEX+37). The predominant vegetation is Central American pine-oak forest over a highly rugged terrain. The Sierra del Merendón, from which the allotype and paratypes were collected, is a mountain range extending from northwest Honduras into southeast Guatemala bordered by the Lempa and Motagua River valleys. The size of the region and its typographical complexity supports four principal forest ecotypes; 1) tropical lowland dry forest, 2) tropical moist forest, 3) montane cloud forest (above 1,200m) and 4) the Bosque Enano or ‘dwarf forest’ occurring at the highest elevations (above 2,000m). The Parque Nacional Cusuco, surrounding Montaña San Ildefonso (also known as Cerro Jilinco), from which the paratypes were collected, is located within the Sierra del Merendón, and is a protected area of 23,440 hectares (Slater et al. 2011). The vegetation is mostly montane secondary broad-leaved forest interspersed with pines, which dominate steeper slopes with palms or bamboo thickets along elevated ridges and tree ferns at lower altitudes (NR, pers. comm.). All nymph specimens were collected in small clearings on low vegetation, usually in the early morning when individuals were found commonly at the apex of herbaceous plants ca. 1-2m tall often hanging upside-down on the underside of a leaf or branch.
A name in the genitive case, this species is named after “Chespirito”, the screen name of famous late Mexican TV comedian Roberto Gomez Bolaños. Chespirito created and portrayed several characters cherished across Latin America, including “El Chavo del Ocho” and “El Chapulín Colorado”, the latter a sort of superhero whose outfit was inspired by grasshoppers or “chapulines”.
Genitalia: Left phallomere – Sclerite L4B roughly oval, much longer than wide, left margin projected anteriorly; afa with the anterior part smooth and short, posterior part elongated, curved towards the right, clubbed and bearing spines at the apex; loa elongate, without projections, glabrous; paa elongate, slightly flattened, curved 30° to the left, apex curved anteriorly; sclerite L4A elongate, without projections other than the pda; pda elongate, curved to the right, uniformly broad, tapering at the apex, ending in a sclerotized spine (Fig. (Fig.20).20). Right phallomere – roughly triangular, rounded posterior apex; right arm elongate, broad, without projections; anterior process elongate and slender; aa oval and slender; pva short, smooth, apex blunt and well sclerotized; pia short, well sclerotized (Fig. (Fig.2121).
Egg case: somewhat barrel-like, laterally compressed, posteroventral end encircling substrate to which it is attached, ventral surface away from, and forming an angle with the substrate. External wall russet brown in color and rough in appearance. External coating in the form of a whitish layer of frothy material. The coating extends over the emergence area and adjacent dorsal surface of egg case. Exhibiting 40–44 egg chambers whose boundaries are clearly visible as sigmoidal markings along the dorsolateral surface the egg case (external coating might conceal this feature in some specimens), and with as many emergence openings as egg cambers, aligned to form two parallel rows along the dorsal margin. Some emergence openings can be seen on a long, relatively straight, and upwardly projected, distal process (Fig. (Fig.22).22). Approximated measurements: length: 35; width: 15; distal process: 22.
Male genitalia: Costa Rica, Puntarenas, P. N. Piedras Blancas, Esquinas Lodge (NW – Golfito), 15.v.1996, D. Brzoska, GSMC005332, GD0097 (CLEV). Ootheca: Antemna rapax, ANSP.
Our molecular phylogenetic analyses confirmed our morphology based hypothesis of a unique taxon, Hondurantemna chespiritoi, being placed within the subfamily Antemninae. Our analysis also recovered Antemninae and Stagmomantinae as closely related, with the latter recovered as paraphyletic. This result suggests that current classification does not represent natural lineages, a pattern that repeats across various major lineages within Mantodea (Svenson and Whiting 2009, Svenson et al. 2015, Rivera and Svenson 2016). Our results being incongruent with current classification is due to either: 1) Antemninae is a lineage within Stagmomantinae, or 2) Stagmomantis does not represent a monophyletic genus and Stagmomantinae is likely in need of revision. Given the highly complex taxonomic history, and poorly understood relationships within Stagmomantis (Maxwell 2014), it is likely that the genus in its current composition is not monophyletic. We recovered a nymphal specimen, listed as Stagmomantis 1, as sister to (Antemna + Hondurantemna) (Fig. (Fig.1).1). Stagmomantis 1 was collected in the Dominican Republic and this specimen is likely Stagmomantis domingensis (Palisot de Beauvois, 1805), a species placed in a monospecific genus, Isomantis Giglio-Tos, 1917, which Terra (1995) synonymized with Stagmomantis. The position of Stagmomantis 1 in this analysis indicates that it is not a true Stagmomantis, adding support to Giglio-Tos’ (1917) Isomantis. However, a larger taxon and gene sampling within Stagmomantinae is necessary to better understand the organization within Stagmomantinae and its affinities with other lineages.
There are two non-exclusive explanations for differing morphologies in immatures and adults. Adaptive responses to changes in habitat and resource (i.e. prey) use during postembryonic development, e.g. Acontista (Salazar 2003) or different selective pressures on adult males and females leading to sexual dimorphism (Slatkin 1984, Shine 1989, Svenson et al. 2016). Praying mantis females are thought to be under selective pressure for increased fitness leading to a more cryptic life style, while males are selected for increased mobility and mate location (Edmunds 1976, Hurd 1999). As the development of immatures progresses, morphological differences between males and females become more accentuated, with nymphs resembling only one of the sexes, e.g. Pseudopogonogaster (Rivera et al. 2011).
Nymphs of both sexes and adult males of Hondurantemna chespiritoi exhibit cryptic features to resemble small twigs. These include brown coloration, presence of a medial ocellar process (Figs (Figs3A3A and 15A), mid- and hindlegs bearing lobes (Figs (Figs9,9, ,10,10, ,16),16), and the presence of abdominal, sternal lobes on males (Figs (Figs1111 and and17).17). All of these characters can have a masquerading effect by disrupting the body outline, making difficult location of individuals in their natural environment (Edmunds and Brunner 1999). In females, as immatures reach adulthood, the medial ocellar process becomes increasingly small and eventually is lost (Fig. (Fig.15),15), the size of the leg lobes relative to the leg decreases (Fig. (Fig.16),16), coloration changes from brown to green (Fig. (Fig.18),18), and the abdomen swells. This latter feature is particularly pronounced, as the abdomen becomes increasingly enlarged during postembryonic development due to the production of large egg masses (Roy 1999). The enlarged abdomen would be prohibitive to a twig-like cryptic strategy in females, as body outline becomes too distinct and conspicuous. We hypothesize that different selective pressures on females forced their departure from the twig strategy employed as a nymph and drove the reduction of twig-like characters and the evolution of enlarged, leaf-like forewings that could conceal the large abdomen. Their predominately green coloration would additionally enhance the cryptic effect by blending within strongly green vegetation. These features would help adult females resemble leaves as their central cryptic strategy, unlike adult males, which retain the same cryptic strategy of nymphs.
The ontogenetic changes of Hondurantemna chespiritoi brings to question the identity of nymphs described by Agudelo et al. (2002). The authors described first instar nymphs, which they assigned to Antemninae based on the morphological similarity of the nymphs with adults of Antemna rapax. Those nymphs, despite their general similarity to A. rapax, lacked the medial ocellar process and femoral lobes on the mid- and hindlegs, characteristic of A. rapax. The authors noted those characters could develop during posterior development, but chose not to assign the nymphs to a genus until early instar nymphs of A. rapax or the adult of the nymphs they described became known. The changes during ontogenetic development of Hondurantemna described here are comparable to the changes expected if those nymphs are A. rapax. However, the Antemna ootheca described here is distinct from the description and images provided by Agudelo et al. (2002). Additional material and studies are necessary to confirm the placement of those nymphs within Neotropical Mantodea.
Hondurantemna chespiritoi is exemplary of large, undiscovered insect diversity yet to be documented. Although H. chespiritoi has fascinating post-embryonic changes that indicate distinct selective pressures acting on both sexes, the pattern may be more common than we realize, considering the lack of information on nymphal biology. This study shows the importance of describing all life stages and both sexes whenever possible, to prevent misidentification of conspecific specimens and bring to light the natural history of the species.
We thank Mr Roger Roy and Dr Philippe Grandcolas from the Muséum National d’Histoire Naturelle and Dr Brian Fisher and Dr Norm Penny from the California Academy of Sciences for the loan of the material. Dr. Jason Weintraub for allowing JR to access the Antemna rapax ootheca and Rick Wherley for imaging it. Operation Wallacea Ltd organized the field expedition to Honduras. Permits for collections in El Parque Nacional Cusuco and export permits were provided by the Instituto Nacional de Conservación y Desarrollo Forestal facilitated by Roberto Downing. We thank Dr Merlijn Jocque, Royal Belgian Institute of Natural Sciences, Aquatic & Terrestrial Ecology (ATECO), Belgium, for support in acquiring immature and adult specimens used to describe the post-embryonic development and to carry out the molecular analyses. We also thank Dr Nicole Gunter and Marlene Harmon for their help with the DNA extraction and PCR, and to Andrew Snyder and Ethan Staats for kindly allowing us to reproduce their photograph of living specimens taken at Cusuco National Park, Honduras. HMR thanks CNPq for the funding through the Brazilian program “Ciências sem Fronteiras”, process number 2007002014-6. This project was supported, in part, by the National Science Foundation under the grant DEB-1216309 to GJS. Any opinions, findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation or the Cleveland Museum of Natural History. No conflict of interests exist.
Rodrigues HR, Rivera J, Reid N, Svenson GJ (2017) An elusive Neotropical giant, Hondurantemna chespiritoi gen. n. & sp. n. (Antemninae, Mantidae): a new lineage of mantises exhibiting an ontogenetic change in cryptic strategy. ZooKeys 680: 73–104. https://doi.org/10.3897/zookeys.680.11162