Rotundiforma, Meng, Rui, Wang, Yinglun & Qin, Daozheng, 2013

Meng, Rui, Wang, Yinglun & Qin, Daozheng, 2013, A new genus of the tribe Hemisphaeriini (Hemiptera: Fulgoromorpha: Issidae) from China, Zootaxa 3691 (2), pp. 283-290 : 284-287

Rotundiforma gen. nov.

Type species. Rotundiforma nigrimaculata , sp. nov. by monotypy

Description. Body smooth, nearly round ( Fig. 1 ). Head with eyes slightly narrower than pronotum ( Fig. 1 ). Vertex rectangular, anterior margin straight, posterior margin shallowly concave, disc with two depressions ( Fig. 1 ). Frons flat, lateral margin angulate at widest part ( Fig. 2 ). Frontoclypeal suture slightly arcuate. Clypeus with two longitudinally semilunar pits ( Fig. 2 ). Rostrum short, not reaching post trochanters. Ocelli absent. Eyes oval. Pronotum with two small central pits; anterior margin archedly convex, posterior margin slightly convex. Mesonotum large, nearly triangular, with two small pits in lateral areas. Forewings with obscure venation, relatively wide, costal margin and apical margin widely round convex ( Figs 1, 3 ). Hind wings much reduced ( Fig. 4 ). Hind tibia widened at apical half and with two lateral spines. Spinal formula of hind leg 15–6 (7)–2.

Male genitalia: Anal tube nearly ovate in dorsal view ( Fig. 7 ). Genital style short, with median area elevated, hind margin concave, caudodorsal angle rounded ( Figs 5, 6 ). Capitulum short and flat, with a large lateral tooth ( Fig. 8 ). Aedeagus asymmetrical, without processes ( Figs 9–11 ). Connective thick and short. Pygofer with posterior margin slightly convex at dorsal half ( Fig. 5 ).

Female genitalia: Anal tube elliptical ( Fig. 12 ). Gonoplacs weakly elevated in median area, in profile nearly rectangular ( Figs 13, 15 ). Anterior connective lamina of gonapophysis VIII with three teeth in apical group ( Fig. 17 ). Gonocoxae VIII nearly rectangular, with hind margin weakly concave ( Fig. 17 ).

Diagnosis. This new genus is similar to Gergithus according to the general body shape. However, in contrast, the aedeagus is asymmetrical, without processes; this places Rotundiforma closest to Hemisphaerius . But it can be distinguished by the following features: 1) frons with lateral margin angulate at widest part, in Gergithus and Hemisphaerius , lateral margin smooth; 2) forewings relatively wide, in Gergithus and Hemisphaerius , forewings distinctly longer than wide; 3) hind wings very small, in Gergithus , hind wings longer than half length of tegmen, and in Hemisphaerius , hind wings 0.3 times as long as forewings.

This genus resembles Hysteropterissus in the angulate lateral margins of the frons, but can be separated by the following characters: 1) head with eyes narrower than pronotum, in Hysteropterissus , head with eyes almost equal to pronotum; 2) mesonotum flat, 2.0 longer than cumulative length of vertex and pronotum in mid line, in Hysteropterissus , mesonotum elevated, length in midline almost equal to cumulative length of vertex and pronotum; 3) forewings relatively wide, nearly a rhombus, in Hysteropterissus , forewings distinctly long, nearly ellipse.

Etymology. The generic name “ Rotundiforma ” is constituted from the Latin words “rotund-” and “-forma” indicating the nearly round body. The name is feminine in gender.

Distribution. China (Yunnan).

Rotundiforma nigrimaculata sp. nov.

Description. Male length (N=1) (including tegmen): 3.0 mm, length of tegmen: 2.7 mm; female length (N=2) (including tegmen): 3.1 mm, length of tegmen: 2.8 mm.

Colouration: Vertex light brown ( Fig. 1 ). Eyes gray. Frons orange with white fascia ( Fig. 2 ). Clypeus orange. Pronotum and mesonotum pale orange. Forewings yellowish green with one large dark brown blotch near inner margin and a small spot near costal margin medially ( Figs 1, 3 ). Legs generally brown, fore and mid tibiae with apical part black, mid femora with posterior margin black, spinulation of hind leg black.

Head and Thorax: Vertex broad, about 5.6 times wider than long in middle line ( Fig. 1 ). Frons 1.7 times wider at widest part than upper margin, and 1.1 times wider than long in mid line ( Fig. 2 ). Pronotum slightly longer than vertex. Mesonotum large, 2.0 times longer than cumulative length of vertex and pronotum in mid line, 2.3 times wider at widest part than long in middle line ( Fig. 1 ). Forewings nearly a rhombus ( Fig. 1 ). Hind wings extremely rudimentary ( Fig. 4 ). Metatarsomeres I with apical spines diminishing from outside to inside, disappearing near middle.

Male genitalia: Anal tube weakly widening to subapical margin, apex roundly convex ( Fig. 7 ). Anal column short (about 0.2 times as long as anal tube). Aedeagus U-shaped ( Figs 9–11 ). Dorsal phallobase lobe with apex membranous and arched. Lateral margin of lateral phallobase lobes dentate, left side larger than right side in ventral view. Ventral phallobase lobe membranous, slightly shorter than lateral phallobase lobes, narrowing and bifurcated apically.

Female genitalia: Anal tube broader than long in midline ( Fig. 12 ). Anal column short (about 0.3 times as long as anal tube). Gonoplacs with third gonoplac lobes membranous, fork faintly pigmented basally in dorsal view ( Fig. 13 ). Lateral fields of posterior connective lamina of gonapophyses IX slightly arcuate, median field of posterior connective lamina convex with a pair of long lobes ( Figs 14, 16 ). Anterior connective lamina of gonapophysis VIII with three keeled teeth in lateral group ( Fig. 17 ). Endogonocoxal process gradually narrowing apically. Posterior margin of sternum VII with widely short convex, slightly concave medially ( Fig. 18 ).

Material examined. Holotype: male, China, Yunnan Province, Xishuangbanna City, Menglun, N 21º 54' 380'', E 101º 16' 815'', 627 m, 22 November 2009, collected by canopy fogging, coll. Guo Tang and Zhiyuan Yao. Paratypes: 2 females, same data as holotype.

Diagnosis. This species can be differentiated from the most morphologically similar species, Hysteropterissus conspergulus Melichar (Melichar 1906, Fig. 15 ) by the following features: 1) vertex about 5.6 times wider than long in middle line, posterior margin shallowly concave, in H. conspergulus , vertex about 3.0 times wider than long in middle line, posterior margin distinctly concave; 2) pronotum with anterior margin behind the level of eyes, in H. conspergulus , pronotum with anterior margin distinctly convex between the eyes; 3) clypeus and mesonotum orange, forewings yellowish green with one large dark brown blotch near inner margin and a small spot near costal margin, in H. conspergulus , clypeus black, mesonotum dark brown, forewings coarsely wrinkled, brownish yellow, dotted with numerous large and small, locally confluent black spots.

Etymology. The specific epithet refers to the black markings on the tegmen.

Figures

FIGURES 1 – 4. Rotundiforma nigrimaculata sp. nov. 1. adult, dorsal view; 2. frons and clypeus; 3. adult, lateral view; 4. hind wing and forewing. Scale bars = 1 mm.

FIGURES 5 – 18. Rotundiforma nigrimaculata sp. nov. 5. male genitalia, left view; 6. genital style, left view; 7. male anal tube, dorsal view; 8. capitulum, dorsal view; 9. aedeagus, ventral view; 10. aedeagus, right view; 11. aedeagus, left view; 12. female anal tube, dorsal view; 13. gonoplac, dorsal view; 14. gonapophysis IX and gonaspiculum bridge, dorsal view; 15. gonoplac, right view; 16. gonapophysis IX and gonaspiculum bridge, right view; 17. gonocoxa VIII and gonapophysis VIII, right view; 18. sternum VII, ventral view. Scale bars = 0.2 mm.