Neodeuterus admirandus Schaufuss, 1887

Kurbatov, Sergey A. & Cuccodoro, Giulio, 2015, Revision of Neodeuterus Schaufuss and description of a new allied genus from Borneo (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 4006 (2), pp. 374-382 : 377-378

Neodeuterus admirandus Schaufuss, 1887

Neodeuterus admirandus Schaufuss, 1887: 152 . Neodeuterus alter Schaufuss, 1887: 153 (syn. n.).

Type material (2 males, 1 female). Neodeuterus admirandus Schaufuss : lectotype male labelled «Sumatra / Muséum Paris 1917 Coll. A. Raffray / TYPE [red label] / N. admirandus A. Raffray det.», in MNHN, by present designation; paralectotype male labelled «Sumatra tabacs / Syntypus [red label] / Neodeuterus admirandus m. Surin. / " Surinam " ist wohl ein Schreibfehler [=" Surinam " is probably a typo] / C. Schaufuss 1930 / Coll. D.E.I. Eberswalde / Neodeuterus admirandus Schf. », in DEI; Neodeuterus alter Schaufuss : Lectotype female labelled «Tabak Su / Neodeuterus alter m. / C. Schaufuss 1930 / Coll. D.E.I. Eberswalde / Neodeuterus alter Schf. », in DEI, by present designation.

Redescription. Body ( Fig. 1) 1.05–1.15 mm long, reddish-brown, covered with pubescence at most 0.02 mm long. Dorsal part of head sparsely covered with very fine or evanescent punctation, except occipital area and both sides of vertexal depression, which are densely covered with large punctation (distances between punctures much shorter than their diameters). Narrow and rhomboidal occipital depression anteriorly reaching level of tentorial pits, its posterior cariniform margins posteriorly connected to mediodorsal ridge of gular constriction. Tentorial foveae large and deep; distance between them wider than that between each fovea and nearest edge of eye. Antenna with pedicel markedly (male) or slightly (female) longer that wide: antennomeres 3–8 transverse and subequal in width, markedly narrower than pedicel; antennomeres 9 and 10 modified in male, 9 slightly asymmetrical in both sexes. Pronotum with punctation very fine in middle between longitudinal ridges; median sulcus reaching neither antebasal fovea nor anterior pronotal margin. Elytra impunctate, each with one dorsal stria extending posteriorly slightly behind middle of disc. Metaventrite impunctate. Abdomen with punctation on tergites similar to that on central part of pronotum. Tergite 1 with basal carinae well-marked, somewhat curved, nearly reaching posterior tergal margin; maximum distance between carinae subequal to half of width of segment 1. Tergites 2 and 3 with basal carinae less obvious than those on tergite 1, straight, nearly reaching corresponding posterior tergal margin; distance between carinae subequal to one fourth of width of corresponding segment.

Male. Eyes slightly longer than half of head length in lateral view, each with more than 35 facets. Antennae ( Fig. 4 ) with antennomere 9 approximately twice as wide as antennomere 8 and as wide as antennomere 10, its external margin 1.5 times as long as internal one and twice as long as antennomere 8; antennomere 10 about twice as long as wide. Protrochanters with long pointed and slightly curved projection. Protibiae bearing small internal subapical tooth. Last abdominal tergite as in Fig. 8 . Abdominal sternite 7 and 8 as in Figs 8 and 9 , respectively. Aedeagus ( Figs 10–11 ) 0.155 mm long in both known specimens.

Female. Eyes slightly shorter than half of head length in lateral view, with less than 30 facets (partially depigmented). Antennae ( Fig. 5 ) with antennomere 9 approximately 1.5 times as wide as antennomere 8 and one fourth narrower than antennomere 10, its external margin at most 1.5 times as long as internal one and as antennomere 8; antennomere 10 less than 1.5 times as long as wide. Protrochanters and protibiae unmodified. Abdominal sternite 7 and 8 as in Figs 6 and 7 , respectively.

Measurements: HL = 0.18–0.20 mm; HW = 0.18–0.19 mm; HWmax = 0.25–0.29 mm; PL = 0.23–0.30 mm; PW = 0.32–0.36 mm; EL = 0.33–0.40 mm; EW = 0.42–0.50 mm.

Comparative diagnosis. After careful examination of the type specimens of Neodeuterus admirandus (two males) and N. alter (one female), we concluded that essential differences between the two species are features pertaining to usual sexual dimorphism in this group of Pselaphinae . Additionally it seems that both species were caught in the same conditions (ie. in tobacco balls from Sumatra). Therefore we consider these two names as synonyms.

Figures

FIGURES 4 − 11. Neodeuterus admirandus Schaufuss; antenna of male (4) and female (5); female abdominal sternite 7 (6) and 8 (7); male abdominal sternite 7 (8) and 8 (9); aedeagus in lateral (10) and dorsal (11) views. Scale bars = 0.1 mm; up = 4 − 9; down = 10 – 11.