Ischnopodaseticornis ( Sharp, 1883 ) PA–NIK, 2006

PA – NIK, GRZEGORZ, 2006, Taxonomy and phylogeny of the World species of the genus Ischnopoda Stephens, 1837 (Coleoptera, Staphylinidae: Aleocharinae), Zootaxa 1179 (1), pp. 1-96 : 51-53

Ischnopodaseticornis ( Sharp, 1883) , comb. n. ( Figs. 46–47 )

Tachyusa seticornis Sharp, 1883: 226 .

Tachyusa (s. str.) seticornis: Bernhauer & Scheerpeltz, 1926: 586 .

Type material. Lectotype (here designated): ♂: Mexico, Inuqoi ( BMNH) . Paralectotypes: 2♂♂: same data as the lectotype ( BMNH) .

Redescription. Body. Length 2.9–3.1 mm, convex, parallel­sided, weakly glossy; body colour dark brown to pitchy brown; elytra brownish red, legs and antennae brown.

Head quadrate, flattened dorsally, broadly and deeply impressed medially; eyes relatively small, moderately protruding from lateral contours of head, length of each seen from above shorter than postocular region; surface of head with strong and dense isodiametric mesh microsculpture; puncturation fine and moderately dense, inconspicuous in dense microsculpture. Antennae short, clearly increased in width apically, antennomeres 2 and 3 subequal in length, antennomeres 4–6 longer than wide, antennomeres 7–10 quadrate, antennomere 11 nearly conical.

Pronotum quadrate, lateral sides gradually narrowed in straight line to obtuse hind angles; before base with moderately small and shallow transverse impression, broadly and moderately deeply impressed medially; surface with very dense isodiametric mesh microsculpture; puncturation very fine, pinprick­like and dense, inconspicuous; pubescence at midline directed entirely anteriorly.

Elytra transverse, at suture shorter than pronotum at midline; surface without microsculpture; puncturation fine and dense.

Abdomen parallel­sided, bases of tergites 3–5 each with deep transverse impression, first two impressions coarsely punctuate, third impression smooth and inpunctuate, tergal puncturation fine and moderately dense, surface without microsculpture.

Male. Aedeagus as in Figs. 46–47 .

Female unknown.

Remarks. In general appearance, Ischnopoda seticornis is similar to I. sparsa , from which it can be easy distinguished by the head flattened dorsally and strongly impressed medially, the shorter elytra, the antennomere 10 as long as wide (wider than long in sparsa ) and by the pronotal microsculpture more distinct and denser.

Distribution. This apparently rare species is known so far only from the type locality in Mexico.

Figures

FIGURES 46–47. Ischnopoda seticornis (Sharp): 46—aedeagus in lateral view, 47—aedeagus in ventral view.