Acrotrichis muluensis, 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 : 42-44

Acrotrichis muluensis sp. nov.

urn:lsid:zoobank.org:act:910829FF-4316-4109-A7BC-12C0D115A618

Fig. 21

Diagnosis

The form of the genitalia distinguishes this species.

Etymology

Refers to the place of capture.

Type material

Holotype MALAYSIA-BORNEO • ♂; Sarawak, 4 th Division , Gunung Mulu National Park; 100–500 m a.s.l.; I. Hanski leg., BM 1978-524 ; pitfall trap fish bait, MD forest; BMNH.

Paratypes

MALAYSIA-BORNEO • 4 specs; same data as for holotype; BMNH • 4 specs; Sarawak, 4 th division, Gunung Mulu National Park ; 100-500 m a.s.l.; Mar.–May 1978; I. Hanski leg., BM 1978-524 ; pitfall trap fish bait MD forest; BMNH • 1 ♀ (mounted disarticulated on the slide); same data as for preceding; 500–800 m a.s.l.; forest slope 17-21; BMNH .

Note

Many further examples of this species by association from these and other locations returned to alcohol.

Description

SIZE. Habitus ( Fig. 21A ), length 0.68 mm.

COLOUR. Dark yellowish brown, head darker, antennae and legs yellow, covered with yellow overlapping pubescence.

HEAD. Distance across eyes 0.28 mm; antennomeres III–XI, length 0.30 mm; mentum anterior margin concave, corners obtuse, anterior margin shorter than posterior ( Fig. 21F ).

PRONOTUM. Length 0.22 mm, width 0.44 mm, sides strongly rounded in posterior half, angles right angled (viewed from 45°), posterior margin strongly sinuate.

ELYTRA. Length 0.42 mm, width 0.44 mm, with narrow epipleura in anterior half. VENTRUM. Mesoventrum reticulate, without pubescence, keel obliterated before collar, tapering posteriorly to a fine point between the mesocoxae ( Fig. 21G ). Metaventrum reticulate, pubescent, posterior margin between metacoxae narrow with two right angled points at corners, ± 1⁄6 the width of the sclerite.

ABDOMEN. Pygidium with three pairs of longer setae on lateral margins and a pointed apex, anterior border with setae.

FEMALE GENITALIA. Spermatheca ( Fig. 21E, H ).

MALE GENITALIA. Aedeagus ( Fig. 21D ).

Figures

Fig. 21. Acrotrichis muluensis sp. nov. A. Habitus. B. Hind angle of pronotum viewed at 45°. C. Antennomeres III–XI. D. Aedeagus. E. Spermatheca. F. Mentum and submentum ×1120. G. Meso- and metaventra ×305. H. Pygidium.