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

Type material.

Holotype: ♂, China: Hainan Province, Jianfengling National Park (18°42'N, 108°51'E), 20 April 2014, W-C Yang leg.; paratypes: 3♂♂ 2♀♀, data same as holotype; 5♂♂, Hainan, Jianfengling (18°42'N, 108°51'E), 13-16 January 2011, J-K Long and P Zhang; 2♂♂2♀♀, Hainan, Bawangling National Nature Reserve (22°28'N, 106°57'E), 7-11 January 2011, J-K Long and P Zhang; 2♂♂, Hainan Province, Datian National Nature Reserve (19°06'N, 108°47'E), 12-13 April 2013, J-K Long, J-C Xing and Y-B Zhang leg.

Diagnosis.

This new species looks like Sarimodes clavatus Meng & Wang, 2016 ( Meng and Wang 2016: figs 17-32), but differs from the latter by: 1) vertex shorter in middle line than its maximum width, but longer in S. clavatus ; 2) capitulum of genital styles with anterior margin with one triangular prominence near base, but in S. clavatus without triangular prominence; 3) phallobase with dorsal lobe with one stout bidirectional hooked process in lateral view; but with one hooked process in S. clavatus .

Description.

Body length: male 5.02-5.64 mm (N = 13), female 5.73-5.82 mm (N = 4); forewing: male 4.13-4.57 mm (N = 13), female 4.70-4.88 mm (N = 4).

Coloration. General colour yellow-green (Figs 28 , 29 ). Compound eyes brown, ocelli pale green (Fig. 31 ). Forewings (Fig. 28 ) yellow-green, with diffuse brownish irregular speckles near middle. Tip of spines on hind tibiae and tarsi black.

Head and thorax. Head (Fig. 30 ) including eyes narrower than pronotum (0.76: 1.00). Vertex (Fig. 30 ) shorter in middle than the width (0.63: 1.00), median carina liner. Frons (Fig. 32 ) slightly longer in middle than its maximum breadth (1.02: 1.00), median carina stout, lateral carinae slender. Pronotum (Fig. 30 ) shorter in midline than the width (0.24: 1.00). Mesonotum (Fig. 30 ) shorter in midline than the width (0.30: 1.00). Forewings (Fig. 33 ) longer than width (2.00: 1.00), RP simple, reaching apical margin, MP two branched near middle, MP1 and MP2 forked near distal part, CuA forked into two branches in middle of forewing, paralleling MP bifurcation, Pcu and A1 uniting slightly before MP bifurcation. Hindwings (Fig. 34 ) without transverse vein between Pcu+A11 and A12. Spinal formula of hind leg (2)8/6, 10/2.

Male genitalia. Anal tube (Fig. 36 ) longer in middle than its widest breath (2.40: 1.00) in dorsal view, anterior margin obtuse convex, the base extremely narrow, the width near apical 1/4. Anal style (Fig. 36 ) thin, located near middle, surpassing the end of anal pore. Pygofer (Fig. 35 ) with anterior margin straight, posterior margin arched convex in lateral view. Genital styles (Fig. 35 ) with antero-dorsal margin short, anterior margin bearing obvious triangular prominence (Fig. 35a ) and posterior margin bearing unobvious triangular prominence (Fig. 35b ) near base of capitulum. Capitulum with of genital styles irregular triangular, with irregular lobed process in basal of capitulum (Fig. 35c ), neck of capitulum extremely stout (Fig. 37 ). Phallobase (Figs 38 , 39 ) with dorsal lobe simple, apical part membranous, in lateral view, with one stout bidirectional hooked process (Fig. 35d ) on each side, one short directing to anterior-dorsad, one relatively long, directing to posterior-dorsad; ventrolateral lobe with irregularly quadrangular prominence (Fig. 35e ) in basal 1/3 in lateral view; lateral lobe splitting into two branches, more longer than dorsal lobes; ventral lobe shorter than lateral lobe in lateral view, apical part with lobe-liked process (Fig. 39f ) in ventral view. Aedeagus (Figs 38 , 39 ) with one extremely long hooked process on each side (Fig. 38g ) in lateral view, directing to cephalad (Fig. 39g ).

Female genitalia. Anal tube (Figs 40 , 43 ) longer in middle line than the width (2.10: 1.00), apical margin arched convex, lateral margins paralleled. Anal style (Fig. 43 ) relatively long and stout, located in basal 1/4 of anal tube, surpassing the end of anal pore. Gonocoxa VIII relatively long and narrow, gonocoxa VIII with endogonocoxal lobe obvious, with one small claviform sclerotic process, endogonocoxal process membranous and developed (Fig. 44 ). Anterior connective lamina of gonapophyses VIII (Fig. 44 ) with four keels leading to four teeth in lateral group and three teeth in series in apical group. Posterior connective lamina of gonapophyses IX (Figs 45 , 46 ) narrow, sub-triangular in dorsal view, lateral field membranous developed, with triangular membranous process with microvilli (Fig. 45 : lf); sub-lateral field developed and sclerous, with the inner margin waved (Fig. 45 : slf); median field with symmetric goblet-shaped process, apical margin in middle concave (median dorsal process) (Fig. 45 : mdp); distal parts bent at obtuse angled in dorsal view (posterior ventral lobes) (Fig. 45 : pvd). Hind margin of sternite VII obviously convex in medial area in ventral view (Figs 42 , 48 ).

Distribution.

China (Hainan).

Etymology.

The species name is derived from a combination of the prefix “tri-” and Latin noun “hamulata”, referring to the phallobase and aedeagus with three variously hooked processes.

Host plant.

Unknown.

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.