Andixius lingulatus Wang, Zhi & Chen, 2020

Wang, Xiaoya, Zhi, Yan & Chen, Xiangsheng, 2020, Key to species of the genus Andixius Emeljanov & Hayashi (Hemiptera Fulgoromorpha: Cixiidae) with descriptions of two new species, Zootaxa 4802 (3), pp. 440-448 : 444-446

Andixius lingulatus Wang, Zhi & Chen , sp. nov.

Figs 22–42

Diagnosis. The salient features of the new species include: endosoma of aedeagus with a short and small spinose process apically ( Figs 31–34 ); ventral margin of periandrium of laminal process with three spinose process around the ventral margin ( Fig. 34 ); apical right side of periandrium with a large linguiform laminal process ( Fig. 31 ).

Measurements. Body length: male 7.1–7.8 mm (N = 4), female 8.0– 8.8 mm (N = 4).

Coloration. General color yellowish white ( Figs 22–23 ). Eyes brown, ocelli faint yellowish brown, semi-translucent. Antenna yellowish brown. Vertex, face and rostrum generally yellowish white. Mesonotum brown. Forewing semi-translucent, costal vein with 3 small spaced dark brown spots; near claval fork and behind clavus with an irregular tan spot respectively, basal and middle part of forewings with two inner oblique yellow stripes; apical half of wing with brown patches. Hind tibiae yellow. Ventral abdomen yellowish brown.

Head and thorax. Vertex ( Figs 22, 24 ) 0.8 times wider than long; anterior margin slightly curved recessed, posterior margin U-shaped recessed, median carina absent. Frons ( Fig. 25 ) 2.4 times as long as wide. Pronotum ( Figs 22, 24 ) 2.3 times longer than vertex; posterior margin curved recessed in a right angle. Mesonotum 1.3 times longer than pronotum and vertex combined. Forewing ( Figs 23, 26 ) 2.4 times longer than wide, with twelve apical cells and seven subapical cells; RP 3 branches, MP with 5 terminals: MP 11, MP 12, MP 2, MP 3, and MP 4, fork MP 1 +MP 2 basad of fork MP 3 +MP 4. Hind tibia with four lateral spines, two big and the others small; chaetotaxy of hind tarsi: 7–8/7–8, 2nd hind tarsus with 1–3 platellae.

Male genitalia. Pygofer ( Figs 27–28 ) symmetrical, dorsal margin shallowly concaved and U-shaped ventrally, widened towards apex, slightly concaved medially; in lateral view, lateral lobes trapezoidal and extended caudally. Medioventral process in ventral view rounded protruding. Anal segment ( Figs 27, 29 ) tubular, stubby, dorsal margin almost straight, ventral margin curved, apical margin expanded downward in lateral view; 1.1 times longer than wide in dorsal view; anal style strap-shaped, not beyond anal segment. Gonostyli ( Figs 27, 30 ) symmetrical ventrally, inner margin with a small curved process near base; in lateral view, dorsal margin bending inwards medially, apical margin expanded slightly. Aedeagus ( Figs 31–34 ) with six processes, left and right sides of the periandrium flat, ventral margin laminal protruding, the laminal process with four spinose process, three of them around the ventral margin, directed ventrocephalad, apical one short, the top two are slightly longer; another curved upward along the left side of the outer margin of the laminal process and directed left-dorsocephalad. Apical right side of periandrium with a large linguiform laminal process, directed right-dorsocephalad; apex of dorsal margin with an extremely slender spinose process, medium length, curved, directed ventrocephalad. Endosoma slightly sclerotized, apex of ventral margin with a short and small spinose process, directed ventrocephalad.

Female genitalia. Tergite IX ( Figs 35, 36, 38 ) moderately sclerotized, with a large nearly elliptical wax plate. Anal segment ( Fig. 37 ) rectangular, widening to apex, 1.3 times wider than long in dorsal view, anal style strapshaped. Gonapophysis VIII ( Fig. 39 ) elongate, and slightly curved upwards. Gonapophysis IX ( Fig. 40 ) with one middle tooth, distance ratio between middle tooth to apex and length of denticulate portion is 2.8. Gonoplac ( Fig. 41 ) rod-like, 3.9 times longer than wide in lateral view. Posterior vagina pattern as shown in Fig. 42 .

Type material. Holotype: ♂, China: Guangxi, Jinxiu County, Dayaoshan National Natural Reserve (24°08’N, 110°11’E), 10 May 2019, by Ling Qu, Yun-fei Wu and Fan Yang; paratypes: 3♂♂ 4♀♀, same data as holotype.

Etymology. The specific name is derived from the Latin adjective “ lingulatus ”, referring to the one large linguiform laminal process arising from the apical right side of periandrium.

Remarks. This species is similar to Andixius cultratus sp. nov. in appearance, but differs in: (1) ventral margin of periandrium of laminal process with three spinose processes around the ventral margin ( A. cultratus without process in the same position); (2) apical right side of periandrium with a large linguiform laminal process (ventral margin of periandrium with a blade-shaped spinose process at basal 1/ 3 in A. cultratus ); (3) apex of ventral margin of endosoma with a short and small spinose process (apical 1/2 of left side and apical part of periandrium with multiple small teeth in A. cultratus ).

Distribution. China (Guangxi) ( Fig. 43 ).

Figures

FIGURE 43. Geographic distributions of Andixius species.

FIGURES 22–34. Andixius lingulatus sp. nov., male 22. Dorsal view; 23. Lateral view; 24. Head and thorax, dorsal view; 25. Face, ventral view; 26. Forewing; 27. Genitalia, lateral view; 28. Pygofer and gonostyli, ventral view; 29. Anal segment, dorsal view; 30. Gonostyli, lateral view; 31. Aedeagus, right side; 32. Aedeagus, left side; 33. Aedeagus, dorsal view; 34. Aedeagus, ventral view. Scale bars: 0.5 mm (22–25, 27–34); 1.0 mm (26).

FIGURES 35–42. Andixius lingulatus sp. nov., female 35. genitalia, lateral view; 36. genitalia, ventral view; 37. anal segment, dorsal view; 38. tergite IX, caudal view; 39. Gonapophysis VIII and gonocoxa VIII, dorsal view; 40. gonapophysis IX, lateral view; 41. gonoplac, inner lateral view; 42. posterior vagina, ventral view. Scale bars: 0.5 mm.