Acrotrichis geiseri, Darby, Michael, 2019

Darby, Michael, 2019, New Ptiliidae (Coleoptera) from Sarawak in the spirit collection of the Natural History Museum, London, European Journal of Taxonomy 512, pp. 1-50 : 37-39

Acrotrichis geiseri sp. nov.

urn:lsid:zoobank.org:act:59A948B3-4DF3-4595-9201-C8E0A43FE169

Fig. 18

Diagnosis

Only likely to be confused with A. belli sp. nov., but the longer and narrower body and form of the genitalia distinguish it.

Etymology

Named after Michael Geiser, my colleague in the Department of Life Sciences NHM.

Type material

Holotype MALAYSIA-BORNEO • ♂, Sarawak, 4 th division, Gunung Mulu National Park ; above 1700 m a.s.l.; May–Aug. 1978; I. Hanski leg., BM 1978-524 ; UMR forest fish bait traps; BMNH.

Paratypes MALAYSIA-BORNEO • 4 specs (1 ♀ mounted disarticulated on the slide); same data as for holotype; BMNH • 1 spec.; same data as for holotype; Mar.–May 1978; forest ‘ridge’ extra; BMNH .

Description

SIZE. Habitus ( Fig. 18A ), length 0.83 mm. COLOUR. Dark yellowish brown, antennae and legs yellow, dorsal surface covered with fine yellow pubescence.

HEAD. Distance across eyes 0.28 mm; antennomeres III–XI, length 0.33 mm; mentum and submentum chaetotaxy ( Fig. 18H ).

PRONOTUM. Length 0.23 mm, width 0.43 mm, lateral margins strongly rounded (viewed from 45°), hind angles right angled ( Fig. 18B ).

ELYTRA. Length 0.45 mm, width 0.44 mm, elongate.

VENTRUM. Mesoventrum reticulate, without pubescence, keel obliterated anteriorly before collar, extending posteriorly as a long, narrow, parallel sided ridge to between the mesocoxae ( Fig. 18F ). Metaventrum reticulate, pubescent, posterior margin between metacoxae with two sharp points at corners, metacoxae separated by ± ¹⁄₇ the width of the sclerite ( Fig. 18F ).

ABDOMEN. Pygidium with two teeth and a medial point, and a row of setae on the anterior margin ( Fig. 18G ).

FEMALE GENITALIA. Spermatheca ( Fig. 18D ).

MALE GENTITALIA. Aedeagus ( Fig. 18E ).

Figures

Fig. 18.Acrotrichis geiseri sp. nov.A. Habitus. B. Hind angleof pronotum viewed at 45°. C.Antennomeres III–XI. D. Spermatheca. E. Aedeagus. F. Meso- and metaventra ×355. G. Pygidium. H. Mentum and submentum ×965.