Stenothemus parallelus Y. Yang et X. Yang

Yang, Yuxia, Su, Junyan & Yang, Xingke, 2014, Review of the Stenothemus harmandi species-group (Coleoptera, Cantharidae), with description of six new species from China, Zootaxa 3847 (2), pp. 203-220 : 213-214

Stenothemus parallelus Y. Yang et X. Yang , sp. nov.

Figs. 5 , 17, 30‒32, 42

Type material. Holotype ♂ ( MHBU): CHINA: Xizang, Nyingchi , Pêlong , 23.‒28.IX.2007, leg. F.M. Shi. Paratypes: 1♀ ( MHBU): same data as holotype . [all transliterated from Chinese labels].

Distribution. China (Xizang).

Description. Male ( Fig. 5 ). Head black, reddish brown on middle line of vertex, mouthparts light yellow, more or less darkened at maxillary and labial palpi, dark brown at apices of mandibles, antennae black, light yellow at apex of each antennomere, pronotum light yellow, with a dark brown marking on disc, scutellum light yellow, elytra light yellow and mottled with irregular dark brown markings, legs light yellow, black at bases of coxae and tibiae, apices of femora and tarsomeres, more or less darkened at outer sides of femora and outer and dorsal sides of tibiae, prosternum light yellow, meso- and metasterna and abdominal ventrites black brown, light yellow at posterior margins of ventrites and the whole terminal ventrite. Body densely covered with light yellow pubescence, mixed with slightly long, semirecumbent light yellow pubescence and erect black brown setae on elytra.

Head subquadrate, temples straight and slightly converging posteriorly, dorsum moderately convex in central part, surface semilustrous, densely and finely punctate, each side with a smooth and rectangular impression behind antennal socket; eyes strongly protruding, head width across eyes distinctly narrower than pronotum; terminal maxillary palpomeres long-triangular, widest at basal one-third, with apical parts of inner margins arcuate and sharp, acute at apices; antennae extending to elytra midlength, antennomere II about twice longer than wide at apices, III about one-third longer than II, IV longest, from V to XI gradually shortened, XI pointed at apex.

Pronotum about 1.35 times as wide as long, widest nearly in middle, anterior margin arcuate, lateral margins rounded, posterior margin arcuate and narrowly bordered, anterior angels rounded, posterior angles sharp, protruding, disc distinctly convex on posterolateral parts, surface matt, finely and sparsely punctate.

Elytral length about 5 times length of pronotum, 4 times as long as humeral width, with lateral margins slightly diverging posteriorly, surface matt, rugulose-lacunose and finely punctate.

Aedeagus ( Figs. 30‒32 ): ventral process of each paramere bent ventrally about 60 degrees, with the bent portion at apical part distinctly shorter than the basal portion, moderately thickened terminally and subtriangular at apex in lateral view, dorsal plate slightly shorter than ventral process, nearly parallel-sided, obtusely angled at apex; laterophyse rounded at apex.

Female. Similar to male, but head slightly convex on dorsum, pronotum moderately convex on posterolateral parts of disc, elytra with lateral margins distinctly diverging posteriorly, abdominal sternite VIII (Fig. 17) slightly narrowed posteriorly, inverse-tirangularly convex at posterior half of middle sclerotized part, with lateral margins moderately sclerotized, posterior margin wide-triangularly emarginated in middle, lateroapical angles subtriangular, the lobe moderately sclerotized at apex, triangular.

Body length: 11.5‒11.7 mm; width: 2.3‒2.4 mm.

Diagnosis. This species is similar to S. harmandi (Bourgeois) , but can be distinguished by the pronotum distinctly wider than long; aedeagus: ventral process of each paramere moderately bent ventrally, dorsal plate obtusely angled at apex; abdominal sternite VIII of female triangularly emarginated in middle of posterior margin.

Etymology. This specific name is derived from the Latin parallelus (parallel), referring to its aedeagus with nearly parallel-sided dorsal plate of each paramere.

Remarks. The right antennomeres III‒XI and right mesotibia and tarsus of the holotype are missing. The left fore leg and mesotarsomeres II‒V of the paratype are missing.

Figures

FIGURES 5 ‒ 8. Male habitus, dorsal view: 5. Stenothemus parallelus sp. nov.; 6. S. septimus sp. nov.; 7. S. leishanensis sp. nov.; 8. S. laticollis sp. nov. Scale bars: 2.0 mm.

FIGURES 24 ‒ 32. Aedeagus (24, 27, 30. ventral view; 25, 28, 31. dorsal view; 26, 29, 32. lateral view; 26 a. laterophyse, lateral view; 31 a. apex of paramere, dorsoapical view): 24 ‒ 26. Stenothemus fugongensis sp. nov.; 27 ‒ 29. S. distortirudis sp. nov.; 30 ‒ 32. S. parallelus sp. nov. Scale bars: 1.0 mm.