Erymus filiformis, Bordoni, 2017

Bordoni, Arnaldo, 2017, New data on the Oriental Xantholinini. 43. New species and new records from Thailand in the Naturhistorisches Museum of Basel (Coleoptera Staphylinidae) 281 ° contribution to the knowledge of the Staphylinidae, Linzer biologische Beiträge 49 (2), pp. 1219-1229 : 1226-1227

Erymus filiformis nov.sp.

( Figs 16-18 )

Examined material: Holotype ♂: Thailand, Khao Yai Nat. Park , Nakkon Ratchasima, Pha Kluai Mai, 650 m, Maruyama & Katayama 27.IX-4.X.2007 ( cH); paratypes: same data, 1♀ ( cH), 1♂ ( cB).

Description: Length of body 4.4 mm; from anterior margin of head to posterior margin of elytra: 2.3 mm. Body slender, narrow, brown yellowish; antennae brown with the first 3 articles yellowish pale; legs yellowish pale, semitransparent. Head ovoid, with a little rounded sides and largely rounded posterior angles. Eyes large and very protruding. Surface of head with some very fine and sparse punctures. Pronotum a little longer and narrower than head, with oblique anterior margins, largely rounded anterior angles and slightly sinuate sides. Surface with dorsal series of 5 very spaced, fine punctures and lateral series sof 3-4 punctures. Elytra long, dilated posteriad, very longer and wider than pronotum, with marked humeral angles. Surface a little wrinkled, with three series of very fine punctures, one juxtasutural, one median and one lateral. Abdomen with traces of fine, transverse micro-striation and fine, spaced punctation.

Tergite and sternite of the male genital segment as in Figs 16-17 . Aedeagus ( Fig. 18 ) 0.85 mm, ovoid truncate, with very long parameres; inner sac with a tufts of fine, distal spinulae, followed by a broad area covered with fine scales.

Etymology: The specific epithet is the Latin filiformis- e (filiform), in relation to the slender body.

Distribution: The species is known only from the type locality.

Remarks: This species differs from the congeners by the slender, narrow body, the color of the antennae and legs, and the structure of the inner sac of the aedeagus.

Figures

Figs 16-18: Tergite and sternite of the male genital segment and aedeagus of Erymus filiformis nov.sp. (scale bar: 0.1 mm).