Pselaphomorphus melanus Vásquez-Vélez, 2016

Vásquez-Vélez, Laura M., 2016, Revision of the genus Pselaphomorphus Motschulsky, 1855 (Staphylinidae, Pselaphinae: Jubini), Zootaxa 4107 (1), pp. 1-48 : 29-30

Pselaphomorphus melanus Vásquez-Vélez n. sp.

( Fig 21 )

Diagnosis. Pselaphomorphus melanus is characterized by the combination of filiform antennae without clava, and a dark brown coloration with bright yellow pilosity.

Description. Male. Body length 2.4 mm. Dark brown, with yellowish pilosity. Head elongate (length 0.7 mm, width 0.4 mm). Longitudinal sulcus spindle-shaped. Eyes kidney-shaped (diameter 0.1 mm). Antennal length 1.8 mm. Antennomere length as follows: 1 (0.12 mm), 2 and 3 (0.08 mm), 4 to 10 (0.1 mm), and 11 (0.24 mm), clava absent. Maxillary palpi light brown, with short and even pilosity. Pronotum quadrate (length and width 0.5 mm), lateral lobes triangular, basally square and round apically. Basal lobe rectangular, with two truncated projections on both sides. Pronotal disc oval; longitudinal sulci wider towards edges. Elytra length 0.7 mm, width 0.8 mm. Humeral teeth present. Sutural and basal discal fovea present and evident, framed by basal carina. Sutural stria present. Abdominal segments I–V dorsally with length as follows: 0.4, 0.2, 0.15, 0.2, 0.1 (mm). Ventrally, segment V distally round, segment VI with elongate depression, pygidial suture present. Genitalia. Phallobase regular, bilobed. Median lobe straight in lateral view, not going upward. Apical end membranous. Medially with small spine projected to left. Accessory lobes absent ( Figs. 21 B, 21C).

Type material. Holotype (male): “ Costa Rica, Puntarenas, Osa Peninsula. Neotropical Fundation 10 km W Rincon. 20 m. 8°45’30”N, 83°25’00”W. VI-21-1997. R. Anderson. Berlese forest litter” ( KSEM). Paratypes (7): Costa Rica: 1 female, same information as holotype ( KSEM); 1 male, Puntarenas Province, 4 km W Rancho Quemado, 300 m, 8°41’32”N, 83°35’32”W, VI-25-2001, leaf litter R. Anderson ( UNHC); 1 male, Puntarenas, Osa Peninsula, Fundacion Neotropical 10 km W Rincon, 200 m, 8°42’30”N, 83°31’30”W, VI-23-2001, lowland forest litter ( KSEM); 2 females, Puntarenas, Las Cruces Biological Station, San Vito 4 km S, 110 m, 8°47’3”N, 82°57’36”W, VI-19-1998, berlese leaf litter R. Anderson ( KSEM); 1 female, Puntarenas, Osa Peninsula, 5 km W Rincon de Osa, 8°42’N, 83°31’W, 50 m, III-24–30-1973, forest floor J. Wagner, J. Kethley ( FMNH); 1 male, F. Nevermann 17-IX-29 ( MHNG).

Etymology. The name refers to the darker color of the body, from Greak melanos meaning ‘black’.

Figures

FIGURE 21. Pselaphomorphus melanus n. sp. A. Dorsal habitus. B. Aedeagus dorsal view. C. Aedeagus lateral view.