Apatetica glabra, Assing, 2018

Assing, Volker, 2018, On some species of Apatetica WESTWOOD (Coleoptera: Staphylinidae: Apateticinae), Beiträge zur Entomologie = Contributions to Entomology 68 (2), pp. 347-359 : 354-356

Apatetica glabra spec. nov.

urn:lsid:zoobank.org:act:01C0EC41-4144-4C16-812E-1A8A7507673C

( Figs 29–33 )

Type material: Holotype ♂: “ CHINA [20b] – Yunnan, mt. W Gejiu, mixed forest, 23°24'13"N, 103°07'28"E, 1990 m, 25.VIII.2014, V. Assing / Holotypus ♂ Apatetica glabra sp. n. det. V. Assing 2017” (cAss). Paratypes: 1 ♂: “ CHINA [13] – Yunnan, mt. SE Gejiu, graveyard with pine, 23°18'27"N, 103°11'41"E, 2400 m, 20.VIII.2014, V. Assing” (cAss); 1 ♂: “ CHINA: Yunnan, mountain W Gejiu, 23°24'13"N, 103°07'28"E, 1990 m, misted [sic] forest, litter and various debris sifted, 23.VIII.2014, leg. M. Schülke [ CH 14-20]” ( MNB).

Etymology: The specific epithet (Latin, adjective) alludes to the fine punctation of the forebody.

Description: Body length 7.4–8.2 mm; length of forebody 6.3–6.8 mm. Other measurements: headwidth 1.5–1.6 mm; length of antenna 2.8–3.0 mm; width of pronotum: 3.4 mm; length of pronotum 1.9–2.0 mm; length of elytra 3.1–3.3 mm; length of metatibia 1.7–1.8 mm. Habitus as in Fig. 29 . Coloration: body black with the lateral margins of the pronotum and tergite VIII dark reddish-brown; legs black with all or the apical joints of the tarsi reddish to reddish-brown; antennae black with antennomeres II–V reddish and I and XI brown.

Head ( Fig. 30 ) strongly transverse; frons and vertex with fine punctation and without microsculpture, glossy; median portion of vertex with or without impression and with a variable number of coarser punctures; near dorsal margin of eyes with rather shallow rugose striae and with longitudinal microsculpture. Antenna moderately long; antennomeres IV approximately twice as long as broad, V nearly twice as long as broad, VI approximately 1.5 times as long as broad, VII weakly oblong, VIII approximately as long as broad, and IX–X weakly transverse.

Pronotum ( Fig. 30 ) 1.7–1.8 times as broad as long and approximately 2.2 times as broad as head, broadest near posterior angles; disc strongly convex in cross-section, near posterior angles flattened; posterior angles sharply marked and directed posteriad; lateral margins narrowly separated in anterior half; disc with regularly distributed and moderately dense fine punctation; interstices without microsculpture.

Elytra approximately 1.65 times as long as pronotum; each elytron with eight fine striae with very fine, rather weakly defined, and not very dense punctures; intervals flat, with extremely fine micropunctation visible only at high magnification, without microsculpture and glossy. Scutellum weakly transverse. Legs rather short and stout; protarsomeres I–IV probably without sexual dimorphism.

Abdomen ( Fig. 31 ) with microsculpture composed of a mix of isodiametric and transverse meshes of variable length; punctation fine, slightly coarser only in lateral portions of tergite VII and in posterior portion of tergite VIII; tergite VIII apically obtusely pointed, gradually becoming more convex (cross-section) from base to apex.

♂: protarsomeres I–IV weakly dilated; aedeagus ( Figs 32–33 ) 1.7 mm long; ventral process moderately acute apically in ventral view, bent dorsad in lateral view; internal sac with long membranous tube; parameres flattened, apically acute and bent ventrad, extending to apex of ventral process.

Comparative notes: Apatetica glabra is distinguished from the otherwise similar A. laevicollis by larger body size, the coloration of the pronotum and the antennae, fine and regularly distributed punctation of the head and pronotum, finer and less dense punctation of the elytral striae, the microsculpture and punctation of the abdominal tergites, the shape of tergite VIII, and by a much larger aedeagus with a ventral process and parameres of different shapes.

Distribution and natural history: The species is known from two localities in the environs of Gejiu, Southeast Yunnan, China. The holotype and one of the paratypes were siftedfrom litterand various debris ina mixed forest with rich undergrowth at an altitude of 1990 m. For an illustration of the type locality see figure 8 in ASSING (2014). The other paratype was sifted from pine litter and herb roots in a graveyard with old pine trees at an altitude of 2400 m.

Figures

Figs 23–33: Apatetica laevicollis (23–28) and A. glabra (29–33): habitus (23, 29); head and pronotum (24, 30); posterior portion of elytra and abdomen (25, 31); aedeagus in lateral and in ventral view (26–28, 32–33; 28: lectotype). Scale bars:23, 29:5.0 mm; 24–28, 30–33: 1.0 mm.