Tetrichina Chang & Chen, 2020

Chang, Zhi-Min, Yang, Lin & Chen, Xiang-Sheng, 2020, Two new genera with species of the tribe Sarimini (Hemiptera, Fulgoromorpha, Issidae) from China, ZooKeys 956, pp. 31-47 : 31

Tetrichina Chang & Chen gen. nov. Figures 28-39 , 40-48

Type species.

Tetrichina trihamulata Chang & Chen, sp. nov., here designated.

Diagnosis. Related to the genus Sarimodes Matsumura, 1916, but it is distinguished as follows: frons (Fig. 32 ) without obvious verrucae along basal and lateral margins (frons with obvious verrucae in Sarimodes ( Meng and Wang 2016: fig. 18)); forewings (Fig. 33 ) with ScP long, reaching apical margin of forewing, with short vein in base of ScP (ScP only surpassing middle of forewings, without short vein in Sarimodes (op. cit.: fig. 19)); genital styles (Fig. 35 ) irregularly elliptical in lateral view, neck of capitulum extremely long (genital styles irregularly rounded, neck of capitulum short in Sarimodes (op. cit.: fig. 22)).

Description.

Body medium size, slightly flat in dorsal view.

Head and thorax. Width of head including eyes narrower than pronotum (Fig. 28 ). Vertex (Fig. 30 ) quadrangular, shorter in middle than its maximum width in dorsal view, disc of vertex depressed, median carina obscure, with one pit between median and lateral carinae; anterior margin obtusely convex, posterior margin arched concave, lateral margins paralleled. Gena (Fig. 31 ) with one obvious ocellus between compound eye and antenna on each side in lateral view. Frons (Fig. 32 ) irregularly hexagonal, length in midline nearly equal to its maximum breadth; with median and lateral carinae, reaching frontoclypeal suture; without obvious verrucae along basal and lateral margins; basal margin obtusely concaved; frontoclypeal suture slightly arched concave, lateral margins not paralleled; the base narrow, the maximum width below level of antenna. Clypeus (Fig. 32 ) triangular, with median carina stout, short or long. Rostrum just reaching mesotrochanters. Pronotum (Fig. 30 ) triangular, with median and lateral carinae, and with two pits between median and lateral carinae, anterior margin obtusely-angle concaved, posterior margin straight. Mesonotum (Fig. 30 ) triangular, with median and lateral carinae, sublateral carinae obscure. Forewings (Fig. 33 ) irregularly oval, anterior margin distinctly arched convexly, posterior margin straight, apical margin distinctly arched, longitudinal veins obvious, with a few unobvious short transverse veins, without hypocostal plate; ScP long, reaching apical margin, ScP forked one short vein near base, ScP and RP have a common ScP+RP base, RP simple, not forked, MP and CuA forked into two branches near middle of forewing, CuP present, Pcu and A1 uniting near base 2/3 of clavus, clavus almost 4/5 of forewing. Hindwings (Fig. 34 ) well-developed of typical Sarimini type, three lobes, ScP+PR have a common stem, forked near apical part, MP simple, not forked, CuA forked into branched CuA1 and CuA2 near apical part, CuA2 and CuP fused apically, with one transverse vein between RP and MP, MP and CuA1, Pcu and A11 anastomosing at medium distance, Pcu, A11, and A12 not branched, A2 lobe relatively narrow, A2 vein simple. Hind tibiae each with two lateral spines near distal half.

Male genitalia. Anal tube (Fig. 36 ) irregularly pentagonal, longer in middle than its widest breadth in dorsal view, basal part extremely narrow, apical part broad, the maximum width near the apical part. Anal style (Fig. 36 ) relatively long, not surpassing the end of anal tube. Pygofer (Fig. 35 ) symmetrical, irregularly rectangular in lateral view, dorsal and ventral margin paralleled. Genital styles (Fig. 35 ) irregularly elliptical in lateral view, postero-dorsal margin long and nearly parallel to ventral margin, bearing process near base of neck. Capitulum (Fig. 37 ) extremely developed, neck of capitulum extremely long. Phallobase (Figs 38 , 39 ) symmetrical, U-like tube in lateral view, apical part of dorsal lobe with hooked processes on each side in lateral view. Aedeagus (Figs 38 , 39 ) with one hooked process on each side in lateral view.

Female genitalia (Figs 40-48 ). Anal tube (Figs 40 , 43 ) elongate, longer in middle line than its width. Anal style (Fig. 43 ) long, located near base of anal tube, not surpassing the end of anal tube. Anterior connective lamina of gonapophyses VIII (Fig. 44 ) irregularly rectangular, with four keeled teeth in lateral group and three large teeth in apical group. Posterior connective lamina of gonapophyses IX (Figs 45 , 46 ) triangular and narrow in dorsal view. Gonoplacs (Fig. 47 ) irregularly round, without keels. Hind margin of sternite VII with prominence in middle area in ventral view (Fig. 48 ).

Distribution.

China (Hainan).

Etymology.

The generic name is derived from the arbitrary combination of generic name " Tetrica " and word “China”. The gender is feminine.

Figures

Figures 28 - 39. Tetrichina trihamulata Chang & Chen, sp. nov. 28 adult, dorsal view 29 same, lateral view 30 head and thorax, dorsal view 31 same, lateral view 32 head, ventral view 33 forewing 34 hindwing 35 male genitalia, lateral view 36 male anal segment, dorsal view 37 capitulum of genital styles, posterior view 38 aedeagus and phallobase, lateral view 39 same, ventral view. Scale bars: 0.5 mm. Abbreviations: a-obvious triangular prominence, b-unobvious triangular prominence, c-lobed process, d-bidirectional hooked process, e-irregularly quadrangular prominence, f-lobe-like process, g-long hooked process.

Figures 40 - 48. Tetrichina trihamulata Chang & Chen, sp. nov. 40 female genitalia, dorsal view; 41 same, lateral view 42 same, ventral view 43 female anal segment, dorsal view 44 anterior connective lamina of gonapophyses VIII, lateral view 45 posterior connective lamina of gonapophyses IX, dorsal view 46 same, lateral view 47 gonoplacs, lateral view 48 sternite VII, ventral view. Scale bars: 0.5 mm. Abbreviations: lf-lateral field of posterior connective lamina of gonapophyses IX; slf-sublateral field of posterior connective lamina of gonapophyses IX; mdp-medial dorsal process; pvd-posterior ventral lobes.