Homalotrichus yana Pérez, Rodríguez & Asenjo, 2018

Pérez, Luis, Rodríguez, Maryzender & Asenjo, Angélico, 2018, Two new species of Homalotrichus Solier, 1849 (Coleoptera: Staphylinidae) from Peru, Zootaxa 4459 (2), pp. 376-386 : 380-382

Homalotrichus yana Pérez, Rodríguez & Asenjo , sp. nov.

( Figs. 5A–I )

Type material (3♂♂, 3♀♀). Holotype: PERU: ♂, labeled “ PERU: CU[Department of Cuzco], Canchis, / Llutuyo , 14°3'5.04''S, 71°/ 7'28.33''W, 4456 m [altitude in relation to sea level], / 15.i [January].2018, bofedal [high Andean wetlands], L. Pérez / leg.”; “ HOLOTYPE [red label] / Homalotrichus yana / Pérez, Rodríguez & Asenjo / Desig. Pérez et al., 2018” ( MUSM) . Paratypes (5): 1♂, labeled “ PERU: CU, Calca , / 13°14'46.32''S, / 71°49'55.92''W, 4070 m [altitude in relation to sea level], / 12.xii [December].2016, under stone / in high Andean wetlands, / L. Pérez leg.” ( MUSM) . 1♂, labeled: “ PERU: JU[Department of Junin], Laguna / Yanacocha , 10°52'19"S, / 75°59'59"W, 4130 m [altitude in relation to sea level],/ 17.iv [April].2012, J. Grados & I. / Galindo leg.”( FMNH) . 3 ♀♀, labeled “ PERU: CU[Department of Cuzco], Canchis, / Llutuyo , 14°3'5.04''S, 71°/ 7'28.33''W, 4456 m [altitude in relation to sea level], / 15.i [January].2018, bofedal [high Andean wetlands], L. Pérez / leg.” ( MUSM), all paratypes labeled “ PARATYPE [yellow label] / Homalotrichus yana / Pérez, Rodríguez & Asenjo / Desig. Pérez et al., 2018”.

Diagnosis. H. yana sp. nov. can be differentiated from other species of Homalotrichus by the combination of the following characters: head, antennae, pronotum and abdomen black and elytra dark brown ( Fig. 5A–B ), distinctive shape of head, pronotum and elytra ( Fig. 5C ), pronotal impressions kidney-shaped, tergum VII with a triangular process near posterior margin more or less lamellar on males ( Fig. 5A–B, D ) and the internal sclerites of aedeagus as in Figs. 5G–I .

Description. Holotype male (BL: 3.48; BW: 1.05).

Head, antennae, pronotum, and abdomen black, elytra dark brown. Mesocoxae, mesotrochanter, femur and tibiae dark brown, first to fifth tarsomeres brown. Mouthparts light brown, labial palps, maxillary palps and mandibles dark brown ( Fig. 5A–B ).

Head hexagonal, wider than long (HW: 0.67; HL: 0.48) with anterior margin straight, head width about 11.8× eye width. Neck narrower than head (NW: 0.48). Cephalic disk ( Fig. 5A ) with micro-punctation spread heterogeneously forming smooth areas. One macrosetae near anterior edge of eye, one macrosetae near posterior edge of eye and one macrosetae near posterior margin of head ( Fig. 5C ). Eyes medium sized, longer than wide (YL: 0.15 YW: 0.06) located laterally in middle. Antennae longer than length of head and pronotum together, antennomere 1 the longest, slightly incrassate apically, 2–3 elongate and strongly incrassate apically, 4 slightly longer than wide, antennomere 5 subquadrate, from 5 on broader than 2–4 and with distinct basal ridge, antennomere 10 wider than length (width:length = 0.13:0.11), terminal antennomere about 1.4× longer than wide.

Pronotum ( Figs. 5A–C ) wider than long (PW: 0.84; PL: 0.64), anterior and posterior margin straight, lateral margin slightly convex and narrowing to base. Pronotal lateral margin irregular. Pronotal disc with setigerous punctures separated irregularly. Two pronotal impressions kidney-shaped near posterior margin. Four macrosetae near each lateral margin and one small setae on each posterior corner, four macrosetae near anterior margin in middle and two macrosetae near posterior margin in middle ( Fig. 5C ). Scutellum subtriangular with rounded apex and with micro-punctations ( Fig. 5A, C ).

Elytra ( Figs. 5A–C ) longer than wide (EL: 1.01; EW: 1.05) with apex wider than base. Elytron with five well defined lines of punctures and scattered punctures near outer lateral margin. Elytron with line of six setae near inner lateral margin, line of five setae near outer lateral margin, line of six setae very close to outer lateral margin.

Legs. Procoxae conical narrowly separated by prosternal process. Mesocoxae contiguous, elongated and oblique separated by mesosternal process. Metacoxae transverse, with a conical region that articulates with trochanter. Protrochanter, mesotrochanter and metatrochanter triangular. Profemora, mesofemora and metafemora long, mesofemora tapering slightly towards its extreme. Protibiae with 4 spines and 2 setae arranged in one defined row in external-lateral margin, mesotibiae and metatibiae with spines. Tarsi 5-segmented, tarsomere 1–4 small as long as wide (0.03; 0.04). Tarsomere 5 longer than wide (0.17; 0.04).

Abdomen margined ( Fig. 5A ). Terga IV–VII (morphological segments) with subbasal carinae complete. Segments III-VI with two laterosternites per segment, VII with one laterosternite ( Fig. 5D ). Tergum VII with a triangular process more or less lamellar in midline, near posterior margin ( Fig. 5D ). Tergum VIII ( Fig. 5E ) with posterior margin emarginated, trapezoidal shape with three rows of setae arranged horizontally. Row 1 and 3 with four macrosetae each, situated in middle and posterior region respectively. Row 2 with two macrosetae, one macroseta on both lateral margins. Sternite VIII ( Fig. 5F ) with a lobe on middle of posterior margin, 3 rows of setae arranged horizontally. Row 1 and 3 with four macrosetae situated in middle and posterior region respectively. Row 2 with four macrosetae, two macrosetae on both lateral margins. Tergum IX visible in ventral view.

Aedeagus, symmetrical, median lobe bulbous at base, narrow in its middle part. Parameres thin, curved, not exceed the length of aedeagus. In ventral view ( Fig. 5G ), parameres fused basally. In lateral view ( Fig. 5H ), parameres with acute projection near base. In dorsal view ( Fig. 5I ), base of median lobe with an oval membranous area. Internal sclerites as in Figs. 5G–I .

Female. Similar to male, except tergum VII without a triangular process that is more or less lamellar in midline.

Habitat. According to the collection labels, the specimens were collected in pitfall traps and under a stone, in high Andean wetlands.

Distribution. Known from Llutuyo and Calca in Cuzco and Laguna Yanacocha in Junin from 4070 m to 4456 m ( Fig. 7).

Etymology. The specific name “ yana ” means black in Quechua and it refers to the species’ body color. This is a noun in apposition.

Remarks. The number of spines on the protibiae varies between 4–5 in the paratypes.

Figures

FIGURE 5. (A–I) Homalotrichus yana sp. nov., holotype: (A) habitus, dorsal view; (B) habitus, lateral view; (C) arrangement of setae on head, pronotum and elytra; (D) male tergum VI (T6), sternite VI (S6), tergum VII (T7) and sternite VII (S7), lateral view; (E) male tergum VIII (T8); (F) male sternite VIII (S8); (G), aedeagus, ventral view; (H) aedeagus, lateral view; (I) aedeagus, dorsal view. Dotted areas (F–I) represent membranous areas. Circles in (E) represent the external opening of spiracles.