Pylaemenes abramovi, 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 : 277

Pylaemenes abramovi sp. nov. ( Figs 1–4 , 14–15 )

Diagnosis. Pylaemenes abramovi sp. nov. is an extraordinary species that can be easily separated from most other species in the genus by distinctly expanded posterolateral areas on mesonotum and metanotum. P. abramovi sp. nov. is related to P. trapezius Ho, 2016 , but can be separated by 23 antennal segments, unarmed metanotum and serration-like armature on legs in male.

Male ( Figs 1–4 , 14–15 ). Small Dataminae . General colouration of body and legs brown. Body stout. Head rounded. Vertex with 2 pairs of spine-like tubercles between compound eyes, anterior pair longer than posterior pair. Occiput elevated with a short crest, V-shaped dorsally, surface rough; dorsal carina armed with 2 anterior spines and a few short tubercles. Posterior margin of head with 6 small granule-like swellings. Compound eyes small and rounded. Antennae densely covered with short bristles, with 23 segments; scapus triangular in cross section, median longitudinal carina indistinct, longer than third segment, elevated with 2 short tubercles on outer edge, anterior one placed near apex and posterior one placed at middle area; pedicellus oval in cross section, shorter than third segment. Pronotum square, with 4 short tubercles placed before transverse sulcus, also with 2 short tubercles on posterior margin, median longitudinal sulcus indistinct. Mesonotum 2 times as long as pronotum, longer than combined length of metanotum and median segment, posterolateral area expanded and elevated as an apically spinose lamella; sparsely covered with a few small granules, lateral margins interspersed with a few short tubercles; median longitudinal carina elevated, anterior and posterior ends raised and armed with short tubercles. Metanotum square, posterolateral areas elevated and expanded as an apically spinose lamella. Abdomen slender and cylindrical. Median segment narrow, broader than long. Fourth to fifth tergites with paired humps posteriorly. Ninth tergum as long as eighth tergum, with a hump posteriorly. Anal segment longer than ninth tergum, with a small emargination on posterior margin. Poculum cup-shaped, with granulations, posterior margin rounded. Cerci small and flattened, apices rounded. Legs short, sparsely covered with minute bristles. Vomer ( Fig. 4 ) almost symmetrical, constricted apically, apex pointed. All femora thicker than corresponding tibiae, with a mediodorsal serration-like spine apically. Profemora weakly curved basally, anterodorsal and posterodorsal carinae weakly waved, anteroventral and posteroventral carinae unarmed. Anterodorsal carina of mesofemora and metafemora weakly waved, posterodorsal carina with 2 small serrations ( Fig. 1 ), anteroventral and posteroventral carinae with 2 small teeth near apices. Protibiae and mesotibiae weakly waved, posterodorsal carina of metatibiae with a small blunt tooth medially.

Measurements (♂). Body length 31.0 mm; antennae 10.0 mm; head 2.0 mm; pronotum 2.5 mm; mesonotum 5.0 mm; metanotum 3.0 mm; median segment 1.0 mm; profemora 6.0 mm; mesofemora 5.0 mm; metafemora 6.0 mm; protibiae 6.0 mm; mesotibiae 5.0 mm; metatibiae 6.0 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), 24 May–2 June 2016, Abramov, A. V., F3476.30 ( MMUE).

Distribution. Vietnam.

Remarks. Female is unknown. Further material collected from the type-locality is necessary to confirm its relationship with other species in the genus.

Etymology. It is named in honour of Alexei V. Abramov ( Russia) who discovered this new species.

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.