Hainanaella, Qin, Dao-Zheng & Zhang, Ya-Lin, 2007

Qin, Dao-Zheng & Zhang, Ya-Lin, 2007, Hainanaella lutea gen. and sp. nov., a new genus and species of delphacid planthopper (Hemiptera: Fulgoromorpha) from China, Zootaxa 1436, pp. 49-53 : 49-50

Hainanaella gen. n.

Type species. Hainanaella lutea n. sp., here designed.

Description. Small-sized and brownish delphacids. Head longer and narrower than pronotum. Angle of fastigium obtuse. Median carina of frons forked above level of ocelli. Calcar thickly foliate, tectiform, with many black-tipped teeth on lateral margin. Male pygofer with single median process on the midventral margin. Parameres moderately long, divergent. Diaphragm of pygofer broad, sclerotized, armature absent. Aedeagus greatly compressed laterally, plate-like, with subapical tag reflected cephalad. Suspensorium Y-shaped, arms connecting with anal segment, common stem dorsally attached to the aedeagus base. Male anal segment ring-like, caudoventral margin produced medially.

Etymology. The name is derived from the type locality of the type species (Hainan Province). Gender: feminine.

Remarks. Hainanaella is placed into the tribe Delphacini by the following combination of characters: hindwings with 4 veins from band of crossveins to posterior margin; hind tibia with 5 (2 inner + 3 outer) distal spines; calcar of hind tibia thickly foliate, tectiform, with teeth on lateral margin; aedeagus base articulate with anal segment by distinct Y-shaped suspensorium. The features of median facial carina and articulated suspensorium indicates that Hainanaella belongs to the subtribe Numatina.

Using the keys of Ding (2006), Yang (1989) and Fennah (1965), Hainanaella runs to Zhudelphax Ding , Kakuna Matsumura and Thymalops Fennah respectively. It differs from Zhudelphax and Thymalops mainly in the structures of the male genitalia, in Hainanaella the male anal segment being ring-like and the caudoventral margin produced rather than collar-shaped, lateroapical angle produced. From Thymalops is differs by the diaphragm being apparently sclerotized, not membranous and from Zhudelphax by the suspensorium being unbifurcated ventrally and parameres divergent. It differs from Kakuna whose metabasitarsus is nearly as long as tarsomere 2+3 combined, by the pygofer with medioventral process, the diaphragm broad and without armature, the suspensorium Y-shaped and the parameres divergent apically. The new genus also differs from all these genera in the characters of aedeagus (greatly compressed and plate-like laterally).

The new genus is somewhat similar to Ditropsis Wagner and Dicranotropis Fieber using the key provided by Anufriev et al. (1988). It differs from these genera by: male pygofer with single median process on the midventral margin; anal segment produced caudoventrally; aedeagus greatly compressed laterally, without small teeth or denticles on its surface and subapical tag reflected cephalad. It also differs from Ditropsis whose median facial carina is forked above the level of the ocelli, by diaphragm of pygofer without armature, suspensorium Y-shaped and parameres divergent and not pointed apically. It differs from Dicranotropis in laterodorsal angle of male pygofer in profile not produced and parameres moderately long and rather broad.