Retaldar, Zhao, Songping, Bourgoin, Thierry & Wang, Menglin, 2019

Zhao, Songping, Bourgoin, Thierry & Wang, Menglin, 2019, The impact of a new genus on the molecular phylogeny of Hemisphaeriini (Hemiptera, Fulgoromorpha, Issidae), ZooKeys 880, pp. 61-74 : 63-65

Retaldar gen. nov.

Type species.

Retaldar yanitubus sp. nov., here designated.

Etymology.

Genus name masculine from the free combination of the latin word ' rete ' meaning network as for the reticulated forewings and the suffix '- aldar ' from the genus Euxaldar Fennah, 1978.

Diagnosis.

This new genus is similar to the genus Clypeosmilus Gnezdilov & Soulier-Perkins, 2017 in general appearance, but differs by: 1) a more complex and obscure reticular venation of the forewing ( Fig. 1 ) while a simpler pattern is found in Clypeosmilus ( Gnezdilov and Soulier-Perkins 2017, fig. 1A); 2) an asymmetrical male genitalia with the periandrium more developed on right side and the aedeagus processes emerging at different levels, more posteriorly on right side ( Figs 9 , 10 ) while it is symmetrical in Clypeosmilus ( Gnezdilov and Soulier-Perkins 2017, fig. 3A); 3) gonostyli with ventral margin deeply convex ( Fig. 8 ), while it is much more elongated in Clypeosmilus ( Gnezdilov and Soulier-Perkins 2017, fig. 3C). The new genus is also similar to the genus Eusudasina Yang, 1994, from which it differs also by its more complex reticulate venation and by its longer frons, around 1.2 times longer (in middle) than broad at widest part ( Figs 3 , 21 ), only around 0.9 times longer in Eusudasina ( Chan and Yang 1994, fig. 34C). With Euxaldar Fennah, 1978, Retaldar gen. nov. shares the general form of the gonostyli, which is strongly developed ventrally ( Fennah 1978, fig. 251; Gnezdilov et al. 2017, fig. 8) but definitively differs by its distal postero-ventral protuberance ( Fig. 8 ) and by its near-symmetric subapical processes on the periandrium ( Figs 9 , 10 ) while they are asymmetrical in the former ( Gnezdilov et al. 2017, figs 1, 2).

Description.

Head with compound eyes slightly wider than pronotum, almost same width as mesonotum ( Fig. 1 ). Vertex rectangular, obviously broader than long at midline, anterior margin almost straight, lateral margins nearly parallel, posterior margin slightly roundly concave at middle; median carina absent on disc ( Fig. 1 ). Frons obviously longer than wide, gradually broadening from dorsal margin to below the level of antennae, then curved to frontoclypeal suture ( Figs 3 , 21 ); dorsal margin slightly concave, lateral margins slightly broaden below level of compound eyes, median carina nearly invisible. Frons with numerous tiny tubercles on the whole disc. The tubercles larger on the lateral areas, arranged into a vertical line on each side of frons ( Figs 3 , 21 ). Frontoclypeal suture straight ( Figs 3 , 21 ). Gena in lateral view flattened and oblique ( Fig. 2 ). Clypeus in lateral view with a protuberance below frontoclypeal suture slightly surpassing the gena ( Fig. 2 ); in ventral view, clypeus without median carina ( Figs 3 , 21 ). Rostrum reaching midcoxae; apical segment slightly shorter than subapical one. Antennae with scape extremely short, pedicel rounded ( Figs 3 , 21 ). Pronotum triangular, apical margin roundly convex, posterior margin nearly straight, with some faint small nodules on each side or nodules invisible, median carina absent ( Figs 1 , 19 , 20 ). Mesonotum triangular, a little longer than pronotum in midline, without carina on the disc; with ( Fig. 1 ) or without ( Figs 19 , 20 ) some faint small nodules in lateral part apically. Forewings obviously longer than broad, without hypocostal plate, with elevated irregular reticular venations and venation poorly recognizable, costal margin and posterior margin subparallel, costal margin roundly convex, apical margin straight and oblique inward to posterior margin ( Fig. 4 ), CuP obvious, Pcu and A1 fused exceeding middle of clavus ( Figs 1 , 4 ). Hindwing one-lobed. Metatibia with two lateral spines on apical half and seven spines apically.

Male genitalia.

Anal tube in lateral view long and curved ( Fig. 6 ). Pygofer long triangular in lateral view, posterior margin roundly convex ( Fig. 6 ). Gonostyli irregularly quadrangular in profile, almost as high as long, dorsal margin nearly straight, ventral margin strongly convex with a strong posteroapical protuberance, caudo-ventral angle rounded ( Figs 6 , 8 ). Capitulum of gonostyli finger-shaped, with a small peaked spine ( Fig. 8 ). Periandrium tubular, subapical nearly symmetric, medially constricted and slightly asymmetric in ventral view. Aedeagus processes asymmetric, right one emerging more posteriorly than left one ( Figs 9 , 10 ). Aedeagus a little longer than dorsolateral lobe and ventral lobe of periandrium ( Figs 9 , 10 ).

Female genitalia.

Anal tube in dorsal view a little longer than wide ( Fig. 12 ). Gonoplacs nearly rectangular in lateral view, apical margin rounded ( Fig. 13 ), in dorsal view fused at middle near base, broadest near base, outer lateral margins straight and roundly convex at base ( Fig. 14 ). Gonapophysis IX in lateral view long and narrow, boat-shaped ( Fig. 16 ); in dorsal view nearly triangular, basal half broader than apical half, with a spine on each side ( Fig. 15 ); gonospiculum bridge developed ( Fig. 16 ). Gonocoxa VIII long rectangular ( Fig. 18 ). Three teeth at apex and three keeled teeth on outer lateral margin of anterior connective lamina of gonapophysis VIII ( Fig. 18 ). Endogonocoxal process membranous ( Fig. 18 ).

Distribution.

China (Guangxi).

Figures

Figures 1 - 5. Retaldar yanitubus sp. nov. 1 adult (holotype, male), dorsal view 2 adult (holotype, male), lateral view 3 adult (holotype, male), frontal view 4 forewing (paratype, female) 5 hindwing (paratype, female).

Figures 6 - 11. Retaldar yanitubus sp. nov., holotype. 6 male genitalia, lateral view 7 male anal tube, dorsal view 8 gonostylus, lateral view 9 phallic complex, left lateral view 10 phallic complex, right lateral view 11 apical half of phallic complex, ventral view. The arrows on Fig. 8 indicates the distal postero-ventral protuberance of gonostyli.

Figures 19 - 21. Retaldar yanitubus sp. nov., paratype. 19 adult (female), dorsal view 20 adult (female), dorsal view 21 adult (female), frontal view.

Figures 12 - 18. Retaldar yanitubus sp. nov., paratype. 12 female anal tube, dorsal view 13 gonoplacs, lateral view 14 gonoplacs, dorsal view 15 gonapophysis IX and gonaspiculum bridge, dorsal view 16 gonapophysis IX and gonaspiculum bridge, lateral view 17 sternite VII 18 gonocoxa VIII and gonapophysis VIII, ventral view.