Tmesiphorus tanglimontis, Li & Yin, 2021

Li, Qi-Qi & Yin, Zi-Wei, 2021, Four new species of Scydmaeninae and Pselaphinae (Coleoptera: Staphylinidae) from Yunnan, China, Zootaxa 4920 (1), pp. 114-122 : 118-119

Tmesiphorus tanglimontis sp. nov.

( Fig. 3 )

Type material (3 exx.). Holotype: CHINA: Ƌ, labeled ‘ China: Yunnan, Lincang, Mt.Tangli , 24°01'18''N 99°14'20''E, 1758 m, 2020.ii.25, with Odontotermes termites, sifted, Ji-Shen Wang leg., ủfflfiȏȑḿṫḗflŝḭffi’ ( SNUC) . Paratypes: CHINA: 2 ♀♀, same label data as holotype ( SNUC)

Diagnosis. Male. Body moderately stout, length approximately 2.10 mm; antennal club well-formed by enlarged antennomeres 9–11, lacking modification; pronotal length/width approximately 0.93; elytral length/width approximately 0.51; aedeagus slender and symmetrical, oval; each paramere with four setae at apex. Female. Body length 2.07 mm; antennae shorter than male.

Description. Male ( Fig. 3A ). Body length 2.09 mm; color red-brown, tarsi and mouthparts paler. Head ( Fig. 3B ) roundly triangular, approximately as long as wide, length from anterior margin of clypeus to base of vertex 0.35 mm, width across eyes 0.37 mm, with short, dense yellow setae; vertex with two asetose foveae, with short longitudinal carina between foveae, area around foveae shallowly impressed; with setose frontal fovea; eyes greatly prominent, each composed of about 50 facets; occiput broadly rounded, with tufts of dense setae; antennae ( Fig. 3A ) long and slender, length 1.54 mm; antennomere 1 thick and elongate, antennomeres 2–8 each sub- moniliform, antennomere 9 enlarged, longer than wide, antennomere 10 shorter than 9, slightly longer than wide, antennomeres 11 longest, but shorter than 9 and 10 combined. Pronotum ( Fig. 3B ) slightly wider than long, length along midline 0.41 mm, maximum width 0.45 mm, broadest at apical two-fifths; sides anterior to middle rounded, narrowing anteriorly and posteriorly, anterior margin slightly emarginate medially, posterior margin slightly curved; disc roughly punctate, with setae similar to head, median and lateral antebasal foveae asetose. Elytra ( Fig. 3A ) much wider than long, length along suture 0.49 mm, maximum width 0.78 mm; with distinct punctures; discal stria broadly impressed, extending posteriorly to approximately apical two-fifths of elytral length; posterior margin with row of dense setae. Legs elongate, lacking modification. Abdomen ( Fig. 3A ) slightly wider than elytra, length along midline 0.84 mm, maximum width 0.79 mm; tergite 1 (IV) widest, basal sulcus filled with dense setae, with row of long setae along posterior margin, tergite 2 (V) longest, about twice as long as tergite 1 (IV), with densely setose basal sulcus, tergites 3 (VI) and 4 (VII) lacking setae in basal sulcus, tergite 3 (VI) about twice as long as tergite 7 (VII). Aedeagus ( Fig. 4C, D ) 0.26 mm long, strongly sclerotized; median lobe symmetrical, sub-elliptical dorso-ventrally, in lateral view tapering toward apex; parameres almost symmetrical, each paramere with two apical and two preapical setae; endophallus comprising single elongate sclerite.

Female. External morphology similar to that of male, antennae shorter, antennomere 11 slightly smaller than male; each eye composed of about 50 facets. Measurements (as for male): body length 2.07 mm; length/width of head 0.34–0.35/ 0.35–0.36 mm; pronotum 0.42–0.44/ 0.44–0.45 mm; elytra 0.46–0.49/ 0.76–0.78 mm; abdomen 0.82–0.83/ 0.79–0.81 mm; length of antenna 1.33 mm.

Comments. The genus Tmesiphorus is a diverse group containing 74 species distributed in Africa (35 spp.), Asia (22 spp.), Australia (14 spp.), North America (2 spp.), and Oceania (1 sp.) ( Inoue et al. 2019; Newton 2020). Among the Asian fauna, Tmesiphorus tanglimontis sp. nov. is distinct in the less greatly modified antennal clubs of the male, relatively short elytra, markedly long tergite 2 (V) in relation to tergite 1 (IV), and unique structure of the aedeagus. The new species differs from T. marani Löbl distributed in eastern Russia and North Korea ( Löbl 1963) by the smaller body size (2.10 mm vs. 3.4 mm), distinctly shorter postocular margins, and median lobe of the aedeagus in lateral view lacking an apical projection; from T. okinawensis Inoue, Maruyama & Nomura recently described from Japan ( Inoue et al. 2019) by the much shorter setae of the body, deeper and broader discal striae of the elytra, and presence of long discal carinae on tergite 1 (IV) (discal carinae lacking in T. okinawensis ).

Distribution. China: Yunnan.

Etymology. The new species is named after the type locality of the new species, i.e., Tangli Mountain.

Figures

FIGURE 3. Tmesiphorus tanglimontis sp. nov., male. A. Habitus. B. Head and pronotum. C–D. Aedeagus, lateral (C) and ventral. E. Left paramere. Scale bars: 0.5 mm in A; 0.2 mm in B; 0.1 mm in C, D; 0.05 mm in E.

FIGURE 4. Tribasodites tubericeps sp. nov. (A–G. Male. H–J. Female). A. Habitus. B. Head and pronotum. C. Head, in dorsolateral view. D. Mesotibia. E. Metatrochanter. F–G. Aedeagus, lateral (F) and ventral (G). H. Tergite 5 (VIII). I. Sternite 6 (VIII). J. Genital complex. Scale bars: 0.5 mm in A; 0.2 mm in B, C; 0.1 mm in D–J.