Pylaemenes konchurangensis, Ho, 2018

Ho, Wai-Chun George, 2018, Three new species of genus Pylaemenes Stål (Phasmatodea: Heteropterygidae: Dataminae) from Vietnam, Zoological Systematics 43 (3), pp. 276-282 : 278-279

Pylaemenes konchurangensis sp. nov. ( Figs 5–10 , 16–19 )

Diagnosis. Pylaemenes konchurangensis sp. nov. is similar to P. guangxiensis (Bi & Li, 1994) , but can be separated by the more cylindrical and slenderer body, only a tubercle on outer edge of first antennal segment, weakly swollen pre-medially abdomen and elongate and apically emarginated crest on ninth abdominal tergum in female. The male of this new species is similar to P. japonicus Ho, 2016 , but can be separated by the slenderer body, long anterior spines on the dorsal carina of occipital crest, 19 antennal segments and elongate and robust mesothorax.

Female ( Figs 5–7 , 16–17 ). Small Dataminae . Similar to male, but distinctly larger and more robust. General colouration of body and legs brown. Body cylindrical and slender. Head oval. Vertex with 2 pairs of granule-like tubercles between compound eyes, anterior pair slightly larger than posterior pair. Occiput elevated with a short crest, V-shaped dorsally, surface rough and rugose, with granulations. Posterior margin of head with 6 small swellings. Compound eyes small and rounded. Antennae sparsely covered with short bristles, with 25 segments; scapus triangular in cross section, with distinct median longitudinal carina, outer edge with a short tubercle near apex ( Fig. 7 ); pedicellus oval in cross section, roughly as long as third segment. Thorax rough, with very sparse and small granulations, also interspersed with a few enlarged granules. Pronotum square, with a few small granules along each side of longitudinal sulcus, anterior margin curved inwards. Mesonotum almost parallel-sided, slightly expanded posteriorly after post-medial area, longer than combined length of metanotum and median segment; median longitudinal line indistinct, anterior and posterior margins elevated. Metanotum square, distinctly longer than median segment, median longitudinal line indistinct. Mesopleurae and metapleurae with a very few tubercle-like granules. Abdomen rough, with short wrinkles, with very sparse and small granulations, also interspersed with a few enlarged granules. Fourth tergum with a distinct posterolateral granule. Fourth to seventh tergites with an Xshaped carina medially, indistinct on sixth and seventh tergites. Second and third tergites parallel-sided, fourth tergum broadened posteriorly, fifth and sixth tergites narrowing posteriorly. Seventh tergum with a hump-like praeopercular organ posteriorly. Ninth tergum with an elongate crest-like structure posteromedially, apex distinctly emarginated. Anal segment as long as eighth tergum, longer than ninth tergum, with small granules and short tubercles, lateral margins also with a distinct tubercle medially, posterior margin with 3 small emarginations, posterolateral angles gently elevated. Subgenital plate scoop-shaped, with enlarged granules, median longitudinal carina distinct, posterior margin rounded and reaching posterior margin of anal segment. Cerci small, flattened and apices rounded. Legs sparsely covered with short bristles. All femora thicker than corresponding tibiae, with a short mediodorsal tubercle apically. Profemora curved basally, anterodorsal and posterodorsal carinae waved. Anterodorsal and posterodorsal carinae of mesofemora, metafemora, mesotibiae and metatibiae with 2 small blunt teeth. Anteroventral and posteroventral carinae of mesofemora and metafemora with 2 small blunt teeth near apices, also with 2 small blunt teeth medially and post-medially.

Male ( Figs 8–10 , 18–19 ). Small Dataminae . General colouration of body and legs brown. Body slender, distinctly smaller and slenderer than female. Head rounded. Vertex with 2 pairs of short tubercles between compound eyes, anterior pair longer than posterior pair. Occiput elevated with a short crest, V-shaped dorsally, surface rough and rugose; dorsal carina armed with 3 short medial tubercles and 2 anterior spines. Posterior margin of head with 6 small granule-like swellings. Compound eyes small and rounded. Antennae sparsely covered with short bristles, with 19 segments, apices of terminal segments not surpassing apices of protarsi; scapus triangular in cross section, with indistinct median longitudinal carina, as long as third segment, outer edge with a short tubercle near apex; pedicellus oval in cross section, shorter than scapus. Pronotum square, with a few small indistinct granules along each side of indistinct median longitudinal sulcus, transverse sulcus short, anterior margin strongly curved inwards, posterior margin rounded. Mesonotum broadly emarginated medially, with very few small granules, longer than combined length of metanotum and median segment, distinctly longer than profemora or metafemora; median longitudinal carina indistinct, anterior and posterior ends raised; lateral margins with a few small punctuations, posterolateral angles elevated. Metanotum rectangular, longer than wide. Abdomen slender and cylindrical, with inconspicuous granulations. Median segment narrow, broader than long. Third to eighth tergites with small and indistinct humps posteriorly, distinct on fifth tergum. Ninth tergum as long as eighth tergum, with a small crest posteriorly. Anal segment longer than ninth tergum, with 2 median elevations forming 3 small emargination on posterior margin. Poculum cup-shaped, with granulations, posterior margin nearly truncate. Cerci small and flattened, apices rounded. Legs slender, sparsely covered with short bristles. Vomer ( Fig. 10 ) almost symmetrical, constricted apically, apex pointed. All femora thicker than corresponding tibiae, with a short mediodorsal tubercle apically. Profemora weakly curved basally, posterodorsal, anterodorsal, anteroventral and posteroventral carinae waved. Posterodorsal carina of mesofemora and metafemora with 2 small and indistinct blunt teeth, anterodorsal carina waved; posteroventral and anteroventral carinae with 2 small blunt teeth near apices, also with 2 small elevations medially and post-medially. Tibiae indistinctly waved.

Measurements. Body length, ♀ 51.0–57.0 mm, ♂ 41.0 mm; antennae, ♀ 13.0–15.0 mm, ♂ 12.0mm; head, ♀ 4.0 mm, ♂ 3.0 mm; pronotum, ♀ 3.0– 3.5 mm, ♂ 3.0 mm; mesonotum, ♀ 11.0–12.0 mm, ♂ 10.0 mm; metanotum, ♀ 4.5–5.0 mm, ♂ 4.0 mm; median segment, ♀ 1.5 mm, ♂ 1.0 mm; profemora, ♀ 7.0–8.0 mm, ♂ 6.5 mm; mesofemora, ♀ 6.0 mm, ♂ 5.5 mm; metafemora, ♀ 7.0–8.0 mm, ♂ 6.5mm; protibiae, ♀ 6.5–7.0mm, ♂ 6.5 mm; mesotibiae, ♀ 5.0–6.0mm, ♂ 5.0 mm; metatibiae, ♀ 6.5–7.0 mm, ♂ 6.5 mm.

Material examined. Holotype ♀, Vietnam, Gia Lai, c. 40 km N of K’ Bang Town, Kon Chu Rang Nature Reserve (14°30'19''N, 108°32'28''E; elev. 1020 m), 27 September 2011, Abramov, A. V., F3476.11 ( MMUE). Paratypes. 1♀ 1♂, same data as holotype, F3476.12, F3476.10 ( MMUE & HKES) .

Distribution. Vietnam.

Remarks. Egg is unknown.

Etymology. The specific epithet of this new species is derived from the type locality, Kon Chu Rang Nature Reserve in Gia Lai of central Vietnam.

Figures

Figures 1–13. Pylaemenes spp. 1–4. P. abramovi sp. nov. 5–10. P. konchurangensis sp. nov. 11–13. P. konkakinhensis sp. nov. 1. Male left mesofemur, lateral view. 2, 8. Male end of abdomen, lateral view. 3, 9. Male end of abdomen, dorsal view. 4, 10. Male vomer, ventral view. 5, 11. Female end of abdomen, lateral view. 6, 12. Female end of abdomen, dorsal view. 7, 13. Female left antenna, dorsal view. Scale bars: 1–3, 5–6, 8–9, 11–12=5mm; 4, 7, 10, 13=1mm.

Figures 14–21. Pylaemenes spp. 14–15. P. abramovi sp. nov. 16–19. P. konchurangensis sp. nov. 20–21. P. konkakinhensis sp. nov. 14, 18. Male habitus, lateral view. 15, 19. Male habitus, dorsal view. 16, 20. Female habitus, lateral view. 17, 21. Female habitus, dorsal view. Scale bars=5mm.