Acrotrichis acuta, 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 : 30-32

Acrotrichis acuta sp. nov.

urn:lsid:zoobank.org:act:D8360D7E-A1D5-49C3-BD76-78C0BD62A0BE

Fig. 14

Diagnosis

The acute angles of the pronotum and form of the spermatheca distinguish this species.

Etymology

Refers to the sharp corners of the pronotum.

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 13-16; BMNH.

Paratype MALAYSIA-BORNEO • ♀; same data as for holotype; 100–500 m a.s.l.; Mar.–May 1978; MD forest; BMNH .

Description

SIZE. Habitus ( Fig. 14A ), length 0.93 mm. COLOUR. Head black, pronotum dark brown, elytra yellow brown, antennae and legs dusky yellow, dorsal surface covered with yellow pubescence.

HEAD. Distance across eyes 0.34 mm; antennomeres III–XI, length 0.36 mm; mentum and submentum chaetotaxy ( Fig. 14H ).

PRONOTUM. Length 0.30 mm, width 0.55 mm, pubescence not arising from foveolae, hind angles acute (viewed from 45°) ( Fig. 14B ), with a small projecting seta, posterior margin strongly arcuate towards lateral margins, with a short upright seta anteriorly. Scutellum, pubescence arising from shallow foveolae, pubescence along anterior margin short.

ELYTRA. Length 0.57 mm, width 0.56 mm, pubescence arising from arcuate shallow foveolae, less shining than pronotum.

VENTRUM. Mesoventrum reticulate without pubescence, collar extending onto humeri sloping posteriorly to meet lateral margin, lateral margins short, keel pointed between mesocoxae, obliterated anteriorly before collar ( Fig. 14F ). Metaventrum reticulate, pubescent, posterior margin between metacoxae with two sharp points at corners, metacoxae separated by ¼ width of the sclerite ( Fig. 14F ).

ABDOMEN. Pygidium ( Fig. 14G ).

FEMALE GENITALIA. Spermatheca ( Fig. 14 Da, Db).

MALE GENITALIA. Aedeagus ( Fig. 14E ).

Figures

Fig. 14. Acrotrichis acuta sp. nov. A. Habitus. B. Hind angle of pronotum viewed at 45°. C.Antennomeres III–XI. Da–Db. Spermatheca. E. Aedeagus. F. Meso- and metaventra ×325. G. Pygidium. H. Mentum and submentum ×820.