Xotidium flagellum Ogawa & Loebl

Ogawa, Ryo & Loebl, Ivan, 2016, A review of the genus Xotidium Loebl, 1992 (Coleoptera, Staphylinidae, Scaphidiinae), with descriptions of five new species, Deutsche Entomologische Zeitschrift 63 (1), pp. 155-169 : 158

Taxon classification Animalia Coleoptera Staphylinidae

Xotidium flagellum Ogawa & Loebl sp. n. Figs 5b, 6h, 8d

Type material.

Holotype, 1♂, Borneo Sabah, Mt. Kinabalu N. P. summit tr. Pondok Lowii, 2300-2400 m, 28. IV. 1987, A. Smetana, MHNG ENTO 00008953 (MHNG).

Etymology.

The species epithet refers to the presence of a flagellum in the internal sac.

Description

(male). Dorsal and ventral surface almost reddish-brown (Fig. 5b). Antennae almost yellowish-brown, antennomeres VI–XI blackish. Legs reddish-brown to brown; tarsi paler than tibiae and femora. Head, pronotum, and elytra sparsely and finely pubescent.

Head with eye width almost the same as interocular distance. Punctuation sparse and fine.

Pronotum wider than long. Punctuation sparse and fine, as on head. Scutellum with exposed apex.

Elytra as long as wide, widest at basal fourth, lateral margins sharply narrowed apically, minutely serrate at inner part of posterior margin. Punctuation fine and sparse as on pronotum. Sutural striae extending outwards along basal margin to form basal striae, reaching humeral area and joined with lateral striae.

Hypomeron and lateral portion of mesoventrite smooth. Lateral portion of metaventrite finely and sparsely punctate. Metanepisternum about four times as long as wide, without longitudinal line. Mesepimeron almost as long as wide. Metacoxa about six times as wide as metacoxal process. Ventrite I sparsely and finely punctate.

Protarsomere V about three times as long as each I–IV. Mesotarsomere I about three times as long as each II–IV; V about 2.5 times as long as each II–IV. Metatarsomere I about twice as long as each II and III; each II and III about 1.5 times as long as IV; V about twice as long as IV.

Protarsomeres I–III possibly with tenent setae, but invisible at × 80 magnification, not enlarged. Aedeagus about 0.52 mm long; parameres symmetrical, with moderately widened apical section much longer than third of total parameral length; internal sac with a sinuate and curved flagellum, widened basally and apically (Fig. 8d).

Female. Unknown.

Measurements

(n = 1). Length (PL+EL): 1.23 mm, PW: 0.65 mm, EW: 0.69 mm, HW: 0.30 mm, ID: 0.13 mm, PL/PW: 0.62, EL/EW: 1.19. Approximate ratio of each antennal segment in length (width) (n = 1): II 1.4 (0.7): III 1.0 (0.3): IV 1.1 (0.2): V 1.3 (0.3): VI 1.5 (0.3): VII 1.7 (0.4): VIII 1.6 (0.3): IX 1.9 (0.5): X 1.7 (0.5): XI 1.9 (0.6).

Distribution.

East Malaysia: Sabah.

Remarks.

This species is very similar to Xotidium pygmaeum ( Löbl) in the smaller body, but may be easily distinguished by the very long flagellar sclerite of male genitalia.