Tetrichina fuscovinclum Wang & Bourgoin, 2020

Wang, Menglin, Zhang, Yalin & Bourgoin, Thierry, 2020, Notes on genera of Sarimini with description of two new species in the genera Microsarimodes and Tetrichina (Hemiptera: Fulgoromorpha: Issidae), Zootaxa 4858 (4), pp. 589-600 : 594-597

Tetrichina fuscovinclum Wang & Bourgoin , sp. nov.

ZooBank registration: LSID urn:lsid:zoobank.org:act:97DD3616-423A-48A4-B750-84D596841EC6

( Figs 10–24 )

Diagnosis. This new species is similar to Tetrichina trihamulata Chang & Chen, 2020 in general appearance (both collected from Hainan province of China), but differs by: 1) Frons with two large white markings in the middle area ( Fig. 13 ), but without these markings in T. trihamulata ( Chang et al., 2020, fig. 32); 2) The bidirectional hooked process of periandrium much smaller, around 1/4 length of periandrium ( Fig. 17 ), while around 3/4 length of periandrium in T. trihamulata ( Chang et al., 2020, fig. 38).

Etymology. Combination of Latin words “ fuscus ” (meaning dark) and “ vinclum ” (meaning chain), referring to the brownish transverse markings on forewing. Gender: neutral.

Description. Length: male (including forewings) (N=1): 5.2 mm; female (including forewings) (N=1): 5.6 mm.

Coloration. Vertex light yellowish brown, anterior and lateral margins carinated and brown, vertex with two large obscure light brownish markings near base ( Figs 10, 12 ). Compound eyes grey, supported by yellowish-brown callus ( Figs 10, 12 ). Frons light yellowish brown, white at base, median area with one white transverse marking on each side of median carina ( Fig. 13 ); apical and lateral margins carinated and brown, median carina tawny which extending from apex to frontoclypeal sulcus, sublateral carinae brown at apical 1/3 and light yellow at basal 2/3 ( Fig. 13 ); lateral areas with unobvious nearly white tubercles enlarged from apex to base ( Fig. 13 ). Antennae brown, with several grey spots ( Fig. 13 ). Postclypeus dorsal half part light yellow and ventral half part brown, with a short white median carina near frontoclypeal sulcus ( Fig. 13 ). Genae light brown, in lateral view with one light yellow transverse fascia below compound eyes on each side ( Fig. 11 ). Pronotum light brown, anterior and posterior margins carinated and light brown ( Figs 10, 12 ); median area light yellow, lateral areas with several inconspicuous grayish tubercles ( Figs 10, 12 ). Mesonotum light yellowish brown, median and lateral carinae all light yellow ( Figs 10, 12 ). Forewings light brown, longitudinal and transverse veins all brown; forewing with two brownish markings respectively from basal 1/4 and 1/2 of costal margin extending to middle surface of forewing on each side ( Figs 10, 11 ). Hindwings grayish ( Fig. 10 ). Legs grayish, with tip of spines black ( Fig. 11 ).

Head and thorax. Vertex 1.5 times wider in width at middle than length at middle, the angularly protruding level of anterior margin stronger than in T. trihamulata , posterior margin inverted V-shaped ( Figs 10, 12 ). Frons 1.0 times wider at widest part than long in midline, 1.4 times wider at widest part than apical margin ( Fig. 13 ). Pronotum 3.1 times wider in posterior margin than long in midline, 1.0 times longer in midline than vertex ( Figs 10, 12 ). Mesonotum with anterior margin 1.5 times wider than long in midline, 2.0 times longer in midline than pronotum, with an elevated transverse carina on disc ( Figs 10, 12 ). Metatibiotarsal formula: 8-10-2.

Male genitalia. Anal tube in lateral view extremely long and narrow, reaching to posterior margin of gonostyli ( Fig. 14 ); in dorsal view long cylindrical, 1.8 times longer in midline than widest part, widest at apical 1/3, then narrowing to base, apical margin round arc-shaped; anal opening located at basal 1/3 of anal tube ( Fig. 15 ). Pygofer in lateral view broad, dorsal margin straight, anterior and posterior margins sinuate, convex at the same level, posterior margin slightly convex to caudad at middle ( Fig. 14 ). Gonostyli polygonal in lateral view, highest at middle, then narrowing from middle to apex, dorsal margin sloping up then parallel with ventral margin near middle, posterior margin strongly concave in apical 1/3, basal 2/3 strongly protruded caudad with caudo-ventral angle rounded ( Figs 14, 16 ). Capitulum of gonostyli very long and slender, apical part curved and directed cephalad, latero-posterior margin with an auriform process at middle, the anterior margin of auriform process not reaching to the anterior margin of capitulum ( Figs 14, 16 ). Periandrium near apex with pair of bidirectional hooked processes extending 1/4 length of periandrium, this processes broad, with caudal hook apically rounded, anterior hook sharp, and distinctly concave between ( Fig. 17 ); from ventral view these processes curved outward ( Fig. 18 ). Aedeagus with pair of extremely long and slender processes originated from apical ventral part, extending along ventral margin of periandrium, then curved upward near middle reaching almost to the base of dorsal margin of periandrium, tip of these processes pointed ( Fig. 17 ); in ventral view sinuately curved ( Fig. 18 ).

Female genitalia. Anal tube in dorsal view long cylindrical, 2.4 times longer at midline than widest part, apical margin rounded, lateral margins paralleled, anal opening near base ( Fig. 19 ). Gonoplacs in dorsal view very broad, broadest in basal 1/3, median part membranous, fused in middle near base ( Fig. 20 ); in lateral view rounded ( Fig. 22 ). Posterior connective lamina of gonapophysis IX in lateral view long and narrow, boat-shaped, dorsal margin slightly convex near base and middle, apical part sloping to caudad with a sharp process at apex of ventral margin ( Fig. 23 ); in ventral view gonapophysis IX very narrow and clavate, median area membranous and bifurcated at basal 1/3, posterior ventral lobes sharp at apex ( Fig. 21 ). Gonospiculum bridge large, triangular in lateral view ( Fig. 23 ). Anterior connective lamina of gonapophysis VIII triangular, with four keeled teeth in lateral group and three teeth at apex, inner lateral margin without teeth ( Fig. 24 ). Endogonocoxal process membranous, slightly shorter than anterior connective lamina ( Fig. 24 ).

Type materials. Holotype: ♂, China, Hainan Province, Yinggeling, Yinggezui , N 19º 03.049′, E 109º 33.751′, 693 m, 25 viii 2010, coll. Guo Zheng ( IZCAS).

Paratype: 1♀, Hainan Province, Jianfengling , 26 viii 2002, coll. Yanli Che and Peiming Wang ( NWAFU)

Note. This new species refers to the same taxon “ Eusarima sp. 2” in Wang et al. (2016). In our molecular analyses ( Fig. 25 ), genus Tetrichina groups with the genus Duplexissus in a clade relatively basal within Sarimini .

Figures

FIGURE 25. Bayesian 50% consensus tree of Sarimini based on combined genes of 18S rDNA, 28S rDNA, COI and Cytb using Issini (Issus coleoptratus), Parahiraciini (Fortunia sp.) and Hemisphaeriini (Hemisphaerius coccinelloides) as outgroups. The names ‘Gen. nov.’, ‘Eusarima sp. 1’, and ‘sp. 4’ refer to the same taxa as in Wang et al. (2016). Posterior probability support value is provided at each node.

FIGURES 10–18. Tetrichina fuscovinclum sp. nov. 10 adult, dorsal view 11 adult, lateral view 12 head and thorax, dorsal view 13 adult, frontal view 14 male genitalia, lateral view 15 male anal tube, dorsal view 16 gonostylus, lateral view 17 phallic complex, left lateral view 18 phallic complex, ventral view.

FIGURES 19–24. Tetrichina fuscovinclum sp. nov. 19 female anal tube, dorsal view 20 gonoplacs, dorsal view 21 gonapophysis IX and gonospiculum bridge, dorsal view 22 gonoplacs, lateral view 23 gonapophysis IX and gonospiculum bridge, lateral view 24 gonocoxa VIII and gonapophysis VIII, ventral view.