Orbita Meng & Wang

Rui Meng, Yinglun Wang & Daozheng Qin, 2016, A key to the genera of Issini (Hemiptera: Fulgoromorpha: Issidae) of China and neighbouring countries, with descriptions of a new genus and two new species, European Journal of Taxonomy 181, pp. 1-25 : 13-17

Orbita Meng & Wang , gen. nov.

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Figs 4–5

Type species

Orbita parallelodroma Meng & Wang , gen. et sp. nov.

Diagnosis

Orbita gen. nov. can be easily distinguished from most genera in the tribe Issini by vertex quadrangular, tegmen with ScP vein not reaching over middle, MP vein bifurcate near middle a little before the furcation of CuA, hind wing well-developed trilobed and pattern of veins. Beyond these combination features, the new genus is also similar to the genera Sinesarima Yang, 1994 , Neosarima Yang, 1994 , Dactylissus Gnezdilov & Bourgoin, 2014 and Yangissus Chen, Zhang & Chang, 2014. The new genus can be differentiated from Sinesarima and Neosarima by the particular structure of lateral phallobasal lobe and aedeagus no ventral hooks.

This new genus can be distingushed from Dactylissus by the following combination of characters (features of Dactylissus in parentheses): 1) tegmen without hypocostal plate (tegmen with narrow hypocostal plate); 2) vertex with weak median carina (vertex with no carina); 3) pygofer with hind margin concave medially (pygofer with hind margin convex medially)

The new genus differs from Yangissus in the following combination of characters (features of Yangissus in parentheses): 1) frons with distinct median carina reaching to below eyes, without sublateral carinae, lateral margin auricularly extended below antennae (frons with feeble median carina almost reaching to frontoclypeal suture, with feeble sublateral carinae, lateral margin obtusely extended below antennae); 2) hind wing without transverse veins between CuP and Pcu (hindwing with transverse veins between CuP and Pcu); 3) pygofer with hind margin oblique and weakly convex at ventral half, caudo-dorsal angle blunt not protudent (pygofer with hind margin slightly convex medially, caudo-dorsal angle triangularly protrudent); 4) lateral lobe of phallobase becoming into processes at basal one third (lateral lobe bearing processes near apex).

Etymology

The generic name is derived from the orbs on the frons. The name is feminine in gender.

Description

HEAD. Vertex including eyes slightly wider than pronotum ( Fig. 4 A), nearly quadrangular; anterior margin convex at middle; posterior margin subangularly emarginated; all margins ridged; disc depressed; with weak median carina ( Fig. 4 A). Frons wider than long in middle line, gradually widening to below antennae and then abruptly incurved to frontoclypeal suture, as auricula; upper margin almost straight; disc with two large glossy orbs, depressed in middle near frontoclypeal suture, with half median carina between the two orbs ( Fig. 4 C). Frontoclypeal suture curved upward ( Fig. 4 C). Clypeus small, triangular, disc compressed ( Fig. 4 C). Rostrum reaching post-trochanters, apical segment shorter than subapical segment. Eyes large, reniform ( Fig. 4 A, C). Ocelli present. Antennae moderately short, pedicel subglobose with large sensory pits, flagellum moderately long ( Fig. 4 B–C).

THORAX. Pronotum almost as long as vertex in middle line, anterior margin strongly convex between eyes, posterior margin emarginate medially, median carina weak, disc smooth without any tubercula and with two pits in middle area ( Fig. 4 A), paradiscal fields very thin and narrow behind eyes, lateral lobes wide, lamelliform, without any ridge, ventral margin moderately oblique ( Fig. 4 C). Mesonotum triangular, slightly shorter than length of pronotum and vertex together; anterior margin almost straight and slightly convex at middle; with three feeble carinae ( Fig. 4 A).

TEGMEN. Elongate, without hypocostal plate ( Fig. 4 D, see the arrow); basal surface strongly elevated near costal margin, apical margin rounded; inner margin straight, postcostal area much broader than costal area, with 2–3 transverse veinlets; veins ScP+R, MP and CuA separated at base; veins ScP+R forking close to basal cell; ScP not reaching beyond midlength of tegmen, very weak near costal margin; R simple, forked near apex, MP and CuA both forked almost at same level and slightly beyond the union of claval veins, MP1+MP2 forked near apex, MP1 and MP2 respectively biforked just before apex, longitudinal veins distinctly prominent and transverse veins relatively weak. Clavus long, almost reaching apex, two claval veins (Pcu and A1) united at middle of clavus ( Fig. 4 E).

HIND WING. Well developed, trilobed. Veins R and CuA each with two branches near distal part; M fused with CuA near base; A1 separated at base with posterior branch slightly weakened in comparison with the anterior branch at apex; Pcu and A1 fused in their middle section and subsequently diverging in apical part; M, CuP, A2 simple, between R2 and M and between M and CuA1 with single transverse vein (R 2 r-m M 1 m-cu CuA 2 CuP 1 Pcu 1 A1 2 A2 1); CuA2 and CuP fused and thickened at apex ( Fig. 4 F).

LEGS. Fore and median femora slightly dorso-ventrally flattened; fore and median tibiae thin; hind tibia with two or three lateral spines.

MALE GENITALIA. Anal tube elongate, widest at base; lateral margin subparallel, apical margin rounded; slightly arcuately bent down near middle in lateral view; anal column very short, situated at base ( Fig. 5 A). Pygofer with hind margin strongly concave medially, caudo-dorsal angle blunt ( Fig. 5 B). Penis shallowly curved; dorso-lateral phallobase lobes separated into dorsal lobe and lateral lobe, lateral lobe fused with dorsal lobe shortly at basal one third, before and after the fused part, lateral lobe turned into a process directing cephalad and one more process directing caudad; aedeagus without ventral hooks, with a small lateral process at basal one-third ( Fig. 5 D–F). Genital style in lateral view with hind margin distinctly excavated at middle ( Fig. 5 B).

FEMALE GENITALIA. Anal tube in dorsal view elongate, widest at base; lateral margin subparallel, apical margin rounded; column very short, situated at base ( Fig. 5 I). Gonoplac elongate, with wide membranous near apex ( Fig. 5 J–K). Gonapophyses IX long, nearly ovate in dorsal view ( Fig. 5 G). Gonospiculum bridge moderately large, basal part nearly as long as apical part ( Fig. 5 H). Anterior connective laminae of gonapophysis VIII broad with three small teeth apically ( Fig. 5 M). Gonocoxa VIII with hind margin concave ( Fig. 5 M).

SIZE. Size of the single species hitherto recorded ranges from 5.8 to 5.9 mm of males, 6.2 to 6.4 mm of females.

Distribution

China (Fujian Province).

Figures

Fig. 4. Orbita parallelodroma Meng & Wang, gen. et sp. nov., holotype. A. Habitus, dorsal view. B. Habitus, lateral view. C. Frons and clypeus. D. Head and thorax, latero-ventral view. E. Tegmen. F. Hind wing. Scale bars = 1 mm.

Fig. 5. Orbita parallelodroma Meng & Wang, gen. et sp. nov. — A – F. Holotype. A. Male anal tube, dorsal view. B. Male genitalia, lateral view. C. Capitulum of style, dorsal view. D. Phallobase, left view. E. Phallobase, apical half, ventral view. F. Aedeagus, left view. — G. Gonapophyses IX and gonaspiculum bridge, dorsal view. H. Gonapophyses IX and gonaspiculum bridge, right view. I. Female anal tube, dorsal view. J. Gonoplac, left view. K. Gonoplac, dorsal view. L. Sternum VII, ventral view. M. Gonocoxa VIII and gonapophysis VIII, right view. Scale bars = 0.2 mm.