Hainanphasma Ho, 2013

Genus Hainanphasma Ho, 2013 View in CoL

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 View Figure 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 View Figure 1 ). 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 View Figure 1 ); ninth abdominal tergum with small posteromedian crest, not reaching posterior margin of anal segment, shorter than anal segment (Fig. 1 E, F, I, J View Figure 1 ). 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.