Xotidium tarantulatum 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 : 163-165

Taxon classification Animalia Coleoptera Staphylinidae

Xotidium tarantulatum Ogawa & Loebl sp. n. Figs 2 f–i, 5e, f, 6g, 8d, 9e

Type material.

Holotype, 1♂, Mt Tilongkabila (Gunung Tilongkabila), N. Sulawesi, alt. ca. 1300m, 0°35 ’18.14” N, 123°13 ’22.71” E, 10. VI. 2012, R. Ogawa leg. (MZBI).

Paratypes, 1♂1♀, same data as holotype (EUMJ); 2♂, Mt Tilongkabila (Gunung Tilongkabila), N. Sulawesi, alt. ca. 1300-1500m, 0°35 ’18.14” N, 123°13 ’22.71” E - 0°35 ’18.37” N, 123°13 ’22.61” E, 10. VI. 2012, R. Ogawa leg. (EUMJ); 1♂, same data as holotype, but 800-1300m, 0°34 ’28.52” N, 123°11 ’30.61” E - 0°35 ’18.14” N, 123°13' 22.71E, 9. VI. 2012 (EUMJ); 1♂, same data above, but preserved at MHNG; 1♂1♀, Mt. Pontolo, N. Sulawesi, alt. ca. 1400-1800m, 0°54 ’59.77” N, 122°04' 13.10E - 0°54 ’25.07” N, 122°04 ’20.73” E, 25. VII. 2012, R. Ogawa leg. (EUMJ); 1♂, under bark of rotten log, Plot C, ca 400m, Lowland forest, INDONESIA SULAWESI UTARA, Dumoga-Bone N.P., February, 1985, R. Ent. Soc. Lond., PROJECT WALLACE, B.M. 1985-10 (NHM).

Etymology.

The species epithet is derived from Mapala Tarantula, the climbing club of Gorontalo State University.

Description.

Dorsal and ventral surface almost black to dark reddish-brown (Fig. 5e, f), except for abdomen dark reddish-brown. Antennae almost yellowish-brown, antennomeres VI–XI blackish. Propygidium and pygidium paler than other ventrite I–III. Legs reddish-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 slightly wider than long, with an anterior bead. Punctuation sparse and fine, as on head. Scutellum almost as long as wide, with exposed apex.

Elytra almost as long as wide, widest at basal sixth, 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, with microsculpture.

Protarsomere I twice as long as each II–IV; V 2.5 times as long as each II–IV. Mesotarsomere I 2.5 times as long as II; II 1.2 times as long as each III and IV; V 2.5 times as long as each III and IV. Metatarsomere I about three times as long as each II and III; each II and III 1.1 times as long as IV; V about twice as long as IV.

Male. Protarsomeres I–III possibly with tenent setae, but invisible at × 80 magnification, not enlarged. Aedeagus about 0.44 mm long; parameres symmetrical, with weakly widened apical section as long as fourth of total parameral length; internal sac with a sclerite as flagellum, straight, evenly wide, sometimes bent at base.

Female. Protarsomeres I–III not enlarged. Ovipositor simple: gonostylus with a long apical seta, distinctly longer than wide; distal gonocoxites apparently elongated (Fig. 9e). Spermathecae undetected.

Measurements

(n = 9). Length (PL+EL): 1.32-1.43 mm, PW: 0.75-0.79 mm, EW: 0.79-0.89 mm, HW: 0.32-0.36 mm, ID: 0.09-0.13 mm, PL/PW: 0.69-0.76, EL/EW: 0.89-1.02. Approximate ratio of each antennal segment in length (width) (n = 1): II 1.3 (0.7): III 1.0 (0.3): IV 1.1 (0.2): V 1.4 (0.3): VI 1.6 (0.3): VII 1.7 (0.4): VIII 1.6 (0.2): IX 1.9 (0.4): X 1.7 (0.4): XI 2.2 (0.5).

Distribution.

Indonesia: northern Sulawesi.

Remarks.

This species is similar to Xotidium bolmarum Löbl from Lombok in its color and body size, but may be easily distinguished by the straight and more elongate sclerite in the internal sac.