Hainanphasma Ho 2013

GenusHainanphasmaHo, 2013 Type species. Hainanphasma cristata Ho, 2013, by original designation. Included species. H. cristata Ho, 2013, H. diaoluoshanensis Ho, 2013, H. longiacuta sp. nov., H. longidentata sp. nov. Revised diagnosis. The genus Hainanphasma differs from other genera of the Datamini Rehn & Rehn, 1939 by the following combination of characters: The arrangement of cephalic armature (Fig. 2): supra-occipitals present as blunt spines or small elevations, not split into anterior and posterior supra-occipitals; supra-orbitals absent or indistinct; central coronal present. In female, body cylindrical; third to fourth abdominal terga slightly increasing in width; postero-dorsal carina of meso- and metafemora with fin-like lamellae or teeth; antero-dorsal and ventral carinae of meso- and metafemora with small teeth of irregular sizes; fifth abdominal tergum with distinct tubercles and lamellae posteriorly, higher than fourth abdominal tergum; ninth abdominal tergum with distinct posteromedian crest, from slightly shorter to distinctly longer than anal segment. In male, second abdominal tergum rectangle, longer than wide; dorsal and ventral carinae of meso- and metafemora with fin-like or semi-circle teeth of irregular sizes; posterior margin of fifth abdominal tergum with a pair of humps. Eggs capsule brown to darker brown, bearing very sparse setae; micropylar plate with margin elevated and broadened; operculum subcircular, elevated centrally; ventral margin oblique in lateral view. The most closely related genus is Orestes. But in Orestes, supra-occipitals split into anterior and posterior supra-occipitals; supra-orbitals distinct, present as blunt spines or lamellae (Fig. 1 C, D). In female, body robust with widest part at the posterior margin of fourth abdominal tergum or fourth and fifth terga parallel-sided; fourth and fifth abdominal terga with tubercles posteriorly, anterior one larger and higher (Fig. 1 G, H); ninth abdominal tergum with small posteromedian crest, not reaching posterior margin of anal segment, shorter than anal segment (Fig. 1 E, F, I, J). Eggs can be distinguished by capsule and operculum covered with long and dense setae; operculum shape variable elongated to circular, without distinct elevations. Distribution. China, Hainan province.