Retaldar yanitubus, 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 : 66-69

Retaldar yanitubus sp. nov.

Etymology.

Specific epithet built by the arbitrary combination of the alphabet letter “Y” and "anal tube" latinised into " anitubus ", referring to the Y-shaped male anal tube in dorsal view.

Diagnosis.

The species is close to Clypeosmilus centrodasus Gnezdilov & Soulier-Perkins, 2017, from which it differs by its generic characters (complex reticular venation ( Fig. 1 ), more or less quadrangular gonostyli bearing a postero-apical protuberance) and the form of the male anal tube, which is deeply concave on the apical margin, Y-shaped in dorsal view ( Fig. 7 ), while very shallowly concave and cylindrical in the latter species ( Gnezdilov and Soulier-Perkins 2017, fig. 3E). From Euxaldar guangxiensis Zhang, Chang & Chen, 2018, another Guangxi species, it differs by: 1) its tegmina pattern black ( Fig. 19 ) to dark tawny with a yellow slender or broader transverse marking ( Figs 1 , 4 , 20 ), while it is dark brown with more than four yellow irregular markings in E. guangxiensis ( Zhang et al. 2018, figs 1, 3); 2) the form of the male anal tube which is obviously protruded in the later ( Zhang et al. 2018, fig. 10), and 3) the base of periandrium with a finger-shaped dorsal process ( Figs 9 , 10 ), while it is with three dorsal processes in E. guangxiensis ( Zhang et al. 2018, figs 15a, b, 16a, b).

Type materials.

Holotype: ♂, CHINA: Guangxi Province, Jinxiu, Dayaoshan natural reserve, Hekou, 24°14'11"N, 110°14'11"E, 689.9 m, 23 vii 2018, Feilong Yang & Kun Zhao leg.

Paratypes: 2♀♀, same data as for holotype.

Description.

Length: male (including forewings) (N =1): 3.1 mm; female (including forewings) (N =2): 3.3-3.4 mm.

Coloration

Vertex tawny, disc with two dark brown circular markings; anterior, lateral and posterior margins tawny ( Figs 1 , 19 , 20 ). Center of the compound eyes mostly black, surrounded by brown ( Figs 1 , 3 , 20 ) or compound eyes grayish ( Figs 19 , 21 ). Frons mostly tawny, scattered with many yellow nodules on the whole disc ( Figs 3 , 21 ); the central area slightly black ( Figs 3 , 21 ); lateral areas black, with the yellow nodules arranged into a distinct line on each side ( Figs 3 , 21 ); lateral margins tawny ( Figs 3 , 21 ). Clypeus in frontal view tawny, with two vertical dark brown markings at middle ( Fig. 3 ) or tawny but the vertical dark brown markings invisible; the basal part black ( Fig. 21 ). Rostrum tawny ( Fig. 21 ). In lateral view gena tawny ( Fig. 2 ), clypeus with a broad black oblique patch covering the base of the gena and most part of the clypeus ( Fig. 2 ). Antennae dark brown ( Figs 3 , 21 ). Pronotum tawny, with three small yellow nodules present on each side ( Fig. 1 ) or without them ( Figs 19 , 20 ), anterior and posterior margins brown ( Figs 1 , 19 , 20 ). Mesonotum mainly tawny mixed with some black, disc with two small yellow nodules on each side ( Fig. 1 ) or disc black with nodules almost invisible ( Figs 19 , 20 ); anterior margin tawny. Forewings dark tawny, with a discontinuous yellow transverse band from the end of clavus to the middle of forewing ( Figs 1 , 2 ) or the transverse marking lighter and broader ( Figs 4 , 20 ), or the whole forewing black without any markings ( Fig. 19 ); venations tawny or black, reticular and inconspicuous ( Figs 1 , 2 , 4 , 19 , 20 ). Hindwing grayish-brown, with grayish reticulate venations ( Fig. 5 ).

Head and thorax. Vertex 2.5 times wider than long in midline, without median carina; anterior margin straight; posterior margin roundly concaved ( Fig. 1 ). Frons 1.2 times longer in middle than broad at widest part, 1.4 times wider at the widest part than apical margin ( Fig. 3 ). Pronotum with posterior margin 3.6 times wider than long in midline, anterior margin roundly protruded ( Fig. 1 ). Mesonotum with anterior margin 2.0 times wider than long in midline, anterior margin straight ( Fig. 1 ). Forewings 1.6 times longer in longest part than widest part ( Fig. 4 ), clavus obvious, the tip reaching to the middle of forewing in dorsal view ( Fig. 1 ). Metatibiotarsal formula: 2-7/7/2.

Male genitalia. Anal tube in lateral view arc-shaped, gradually narrowing from the base to the end, apical part conical ( Fig. 6 ); in dorsal view anal tube Y-shaped with two long straight posterolateral arms, middle part in between deeply concave; in dorsal view arms as long as median part of anal tube ( Fig. 7 ); anal opening located at the basal 1/4 of anal tube, epiproct protruded ( Fig. 7 ). The highest length of pygofer around 3.4 times of the widest length, no basal notch ( Fig. 6 ). Periandrium with a finger-shaped process originated from dorsal margin of base extending to the middle, directed to caudal ( Figs 9 , 10 ); dorsolateral lobe of periandrium a little longer than ventral lobe ( Figs 9 , 10 ), the ventral lobe in ventral view rounded in apex ( Fig. 11 ). Aedeagus asymmetric, left hooked process emerging at its mid length, S-shaped, curved and directed dorso-cephalad in lateral view, the tip not exceeding the base of right process ( Figs 9 , 10 ); right hooked process almost same length as the left but emerging from its apical 1/4, curved and directed dorsad ( Figs 9 , 10 ); apex of aedeagus rounded in lateral view, slightly exceeding dorsolateral and ventral lobe of periandrium ( Figs 9 , 10 ). The connective with strongly developed tectiductus ( Figs 9 , 10 ).

Female genitalia. Anal tube in dorsal view ovate, widest near middle, 1.2 times longer in midline than widest part, apical margin and lateral margins rounded ( Fig. 12 ); anal opening situated at basal 1/4 ( Fig. 12 ). Gonoplacs in dorsal view fused at middle near base, broadest near base, outer lateral margins straight and roundly convex at base ( Fig. 14 ). Posterior connective lamina of gonapophysis IX in dorsal view nearly triangular, the basal half relatively sclerotized, slightly broader than apical half, apical half membranous, the inner bifurcation at apical 1/3 ( Fig. 15 ); the posterior fibula sclerotized, with a spine on each side on apical 1/4 ( Fig. 15 ). In lateral view, gonapophysis IX long and narrow, dorsal and ventral margins nearly parallel each to another, tip pointed ( Fig. 16 ); gonospiculum bridge in lateral view triangular, needle-like ventrally ( Fig. 16 ). Anterior connective lamina of gonapophysis VIII subrectangular, with three closely situated teeth at apex and three keeled teeth on the outer lateral margin, inner lateral margin without teeth ( Fig. 18 ). Endogonocoxal process membranous, reaching the level of the apical teeth ( Fig. 18 ). Gonocoxa VIII long rectangular, vertical with the gonapophysis VIII ( Fig. 18 ). Hind margin of sternite VII with middle part slightly prominent and truncates in ventral view ( Fig. 17 ).

Molecular data.

Genes sequences were registered in GenBank with accession numbers as following: MN381856 (whole 18S), MN381853 (28S D3-D5), MN381851 (28S D6-D7), MN381857 (COXI), MN332232 (Cytb). The COXI sequence of this species differs respectively by 87 bp (over 601 bp: 14.5%) and 103 bp (over 681 bp: 15.1%) from Eusudasina nantouensis Yang, 1994 (Genbank accession number: HM052838) and Clypeosmilus centrodasus (Genbank accession number: KX761470).

Note.

As in the genus Euxaldar ( Gnezdilov et al. 2017), color and color-pattern variation on forewing is reported in R. yanitubus sp. nov. Forewings might be nearly black ( Fig. 19 ) or dark tawny ( Figs 1 , 2 , 20 ), while color-patterns on the forewing varies from a light yellowish broad traverse band apically curved upward ( Fig. 4 ) to a much thinner band only visible on the middle of forewing ( Figs 1 , 2 ) or even absent ( Fig. 19 ).

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.