Acrotrichis hanskii, 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 : 41-42

Acrotrichis hanskii sp. nov.

urn:lsid:zoobank.org:act:28ADD572-CE8E-4C39-9C75-60F541DE898F

Fig. 20

Diagnosis

The form of the genitalia distinguishes this species.

Etymology

Named after the collector, Ilkka Hanski.

Type material

Holotype MALAYSIA-BORNEO • ♀; Sarawak, 4 th division, Gunung Mulu National Park ; 800–1700 m a.s.l.; 29 Apr. 1978; I. Hanski leg., BM 1978-524 ; pitfall trap fish bait, LMR forest slope 4-6; BMNH.

Paratypes MALAYSIA-BORNEO • 1 ♂, 1 ♀ (the ♂ mounted disarticulated on the slide); same data as for holotype; BMNH .

Description

SIZE. Habitus ( Fig. 20A ), length 0.76 mm.

COLOUR. Dark 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 anterior margin concave, angles acute ( Fig. 20G ).

PRONOTUM. Length 0.19 mm, width 0.28 mm, lateral margins sinuate before acute hind angles (viewed from 45°) ( Fig. 20B ).

ELYTRA. Length 0.44 mm, width 0.44 mm.

VENTRUM. Mesoventrum reticulate, without pubescence, sides shallowly convex, collar with a narrow raised anterior margin, keel obliterated before collar, extending posteriorly to a fine point between the mesocoxae ( Fig. 20F ). Metaventrum reticulate, pubescent throughout, posterior margin between metacoxae with two sharp points at corners, ± ¹∕₅ the width of the sclerite ( Fig. 20F ).

ABDOMEN. Pygidium with indistinct teeth and medial point, anterior border with row of setae ( Fig. 20H ).

FEMALE GENITALIA. Spermatheca ( Fig. 20D ).

MALE GENITALIA. Aedeagus ( Fig. 20E ).

Figures

Fig. 20. Acrotrichis hanskii sp. nov. A. Habitus. B. Hind angle of pronotum viewed at 45°. C. Antennomeres III–XI. D. Spermatheca. E. Aedeagus. F. Meso- and metaventra ×425. G. Mentum and submentum ×1600. H. Pygidium.