Cissidium pauxillum, 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 : 16-17

Cissidium pauxillum sp. nov.

urn:lsid:zoobank.org:act:EAFD8663-FDE3-4910-8DE0-EB87E5F6C004

Figs 6B , 7D , 8B

Diagnosis

The densely foveolate pronotum, the sinuate border of the anterior margins of the keel and the sharply pointed keel between the mesocoxae distinguish this species.

Etymology

From the Latin adjective ‘ pauxillus ’, meaning ‘small’.

Type material

Holotype

MALAYSIA-BORNEO • Sarawak, 4 th division, Gunung Mulu National Park ; May–Aug. 1978; P.M. Hammond and J.E. Marshall leg., BM 1978-49 ; base comp, alluvial forest litter near laboratory; BMNH.

Description

SIZE. Habitus ( Fig. 6B ), length 0.68 mm.

COLOUR. Yellow, antennae, legs and pubescence paler yellow.

HEAD. Distance across eyes 0.18 mm; antennomeres III–XI, length 0.25 mm; mentum widest anteriorly, anterior margin straight.

PRONOTUM. Length 0.17 mm, width 0.27 mm, densely foveolate and pubescent throughout, side margins evenly curved, hind angles right angled ( Fig. 7D ).

ELYTRA. Length 0.37 mm, width 0.30 mm, foveolate and pubescent throughout, evenly rounded, broadest at middle.

VENTRUM. Mesoventrum short, without pubescence, humeri with sharply projecting angles, lateral margins rounded to mesocoxae, serrate throughout, keel lateral margins sharply pointed with a sharply pointed posterior projection between the mesocoxae ( Fig. 8B ). Metaventrum with scattered pubescence, posterior margin between metacoxae concave, metacoxae separated by ± ¼ width of the sclerite.

Figures

Fig. 6. Cissidium spp., habitus. A. C. marshallae sp. nov. B. C. pauxillum sp. nov. C. C. globulum sp. nov. D. C. subfoveolatum sp. nov. E. C. longum sp. nov. F. C. triangulum sp. nov.

Fig. 7. Cissidium spp., pronota.A. C. globulum sp. nov.×450. B. C. longum sp.nov. ×590.C. C.marshallae sp. nov. ×580. D. C. pauxillum sp. nov. ×590. E. C. subfoveolatum sp. nov. ×485. F. C. triangulum sp. nov. ×555.

Fig. 8. Cissidium spp., mesoventra. A. C. globulum sp. nov. ×470. B. C. pauxillum sp. nov ×725. C. C. marshallae sp. nov ×335. D. C. longum sp. nov. ×450. E. C. subfoveolatum sp. nov. ×455. F. C. triangulum sp. nov. ×575.