Cissidium longum, 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 : 14-16

Cissidium longum sp. nov.

urn:lsid:zoobank.org:act:13E2EA7B-06BD-4758-9B6C-56BEDAD14F29

Figs 6E , 7B , 8D

Diagnosis

Identified by the form of the mesoventrum which is unlike any other Sarawak Cissidium .

Etymology

Refers to the form of the keel and lateral margins of the mesoventrum.

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. 6E ), length 0.67 mm.

COLOUR. Yellow, shining, antennae, legs and pubescence yellow. HEAD. Distance across eyes 0.20 mm; antennomeres III–XI, length 0.37 mm; mentum lateral margins sinuate, anterior border straight.

PRONOTUM. Length 0.19 mm, width 0.29 mm, foveolate throughout, foveolae forming short longitudinal depressions at base, side margins strongly sinuate, hind angles acute ( Fig. 7B ).

ELYTRA. Length 0.43 mm, width 0.37 mm, foveolate throughout, evenly rounded, broadest at middle.

VENTRUM. Mesoventrum without pubescence, collar sharply angled posteriorly at humeri, angles projecting, lateral margins straight meeting posterior margin at rounded right angle, without serrations, keel flat topped and parallel sided, widening and stopping short of the collar, tapering slightly between

mesocoxae ( Fig. 8D ). Metaventrum with scattered pubescence, metacoxae separated by ¼ width of the sclerite.

Remarks

The mesoventral characters suggest that this species belongs either to a subgenus of Cissidium or to a separate genus.

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.