Baryopsis glabra, Assing, 2012

Assing, V., 2012, On the Baryopsis species of Peru (Coleoptera: Staphylinidae: Paederinae: Cryptobiina), Linzer biologische Beiträge 44 (1), pp. 335-346 : 336-338

Baryopsis glabra nov.sp. ( Figs 1-7 )

T y p e m a t e r i a l: Holotype 3: " Peru - Ancash, Quebrada Llaca, Cordillera Blanca , 4400- 4500 m, 1.IV.1990, leg. Etonti / Holotypus 3 Baryopsis glabra sp.n. det. V. Assing 2011" (cAss) . Paratypes: 1833, 10♀♀: same data as holotype (cAss, OÖLL) ; 13, 1♀: " Peru - Ancash, Laguna Llanganuco, Orconchocha , 4000 m, 28.III.1990, leg. Etonti " (cAss) .

D e s c r i p t i o n: Body length 10.0- 13.5 mm. Habitus as in Fig. 1 . Coloration: body blackish; legs dark-brown to blackish-brown; antennae reddish-brown to brown, with antennomere I often infuscate; maxillary palpi reddish.

Head ( Fig. 2 ) approximately 1.1 times as long as broad; lateral margins subparallel in dorsal view; posterior angles obsolete, i.e., lateral angles convexly curving towards neck posteriorly; dorsal surface with sparse coarse macropunctation and with dense micropunctation; median dorsal portion without macropunctures; interstices with fine, shallow microreticulation composed of isodiametric meshes; surface moderately shiny. Eyes small, weakly projecting from lateral contours of head and only approximately 1/4 the length of postocular region in dorsal view.

Pronotum ( Fig. 3 ) 1.20-1.25 times as long as broad and approximately as wide as head, or slightly narrower; maximal width in anterior half, weakly tapering posteriorly; lateral margins weakly convex in dorsal view; on either side of midline with a series of punctures each composed of approximately 10 macropunctures; surface with rather dense and very fine micropunctation, but without appreciable microsculpture (traces of almost obsolete microsculpture may be visible only at high magnifications of 200 x or higher) and glossy.

Elytra extremely short, only approximately 0.5 times the length of pronotum, distinctly dilated posteriad; posterior margin obliquely truncate; dorsal surface with sparse and coarse, but shallow macropunctures and with micropunctation, the latter extremely dense, minute, and shallow, visible only at high magnification. Hind wings completely reduced. Metatarsomere I longer than II, but slightly shorter than the combined length of II and III.

Abdomen distinctly wider than forebody, widest at segment VI; punctation fine and sparse; interstices with very fine microsculpture composed of transverse meshes; posterior margin of tergite VII without palisade fringe; posterior margin of tergite VIII strongly convex, without sexual dimorphism.

3: protarsomeres I-IV strongly dilated; sternite VII not distinctly modified; sternite VIII with rather deep, V-shaped posterior excision ( Fig. 4 ); aedeagus ( Figs 5-7 ) approximately 1.7 mm long; ventral process slender, apically dilated (ventral view) and hooked (lateral view).; parameres slightly projecting beyond apex of ventral process.

♀: protarsomeres I-IV distinctly dilated, but less so than in male.

E t y m o l o g y: The specific epithet (Latin, adjective: glabrous) alludes to the glossy, only obsoletely microsculptured pronotum, one of the characters distinguishing B. glabra from the following species.

C o m p a r a t i v e n o t e s: Baryopsis glabra is readily distinguished from the two following species by the glabrous pronotum, the shallower microsculpture of the head, the shape of the pronotum, body size (intermediate between B. minor and B. ingens , without overlap), and by the different shape of the ventral process of the aedeagus. It is separated from B. calcarata (type locality: "montagnes du Pérou ") by smaller size (B. calcarata: 17 mm), much shorter elytra (longer than pronotum in B. calcarata), the subdued shine of the head, the completely reddish maxillary palpus, the blackish coloration of the elytra (B. calcarata: with distinct violet hue), the absence of transverse impressions on the pronotum, and the unmodified male sternite VIII (B. calcarata: posterior margin distinctly concave. Baryopsis montivagans (type locality: Cerro de Pasco), whose body size is only slightly larger than that of B. glabra , has a parallel-sided, shallowly microsculptured pronotum, a more pronounced microreticulation of the head (also in posterior dorsal portion), strongly microsculptured, posteriorly less strongly dilated elytra, and a distinctly larger aedeagus with a longer, apically not dilated (ventral view) and differently shaped (lateral view) ventral process.

D i s t r i b u t i o n: The specimens were collected in two localities in Ancash province in the northern Peruvian Andes at altitudes of 4000-4500 m.

Figures

Figs 1-7: Baryopsis glabra nov.sp.: (1) habitus; (2) median portion of head; (3) median portion of pronotum; (4) male sternite VIII; (5-6) aedeagus in lateral view; (7) aedeagus in ventral view. Scale bars: 1, 4-7: 1.0 mm; 2-3: 0.5 mm.