Cissidium marshallae, 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 : 17-18

Cissidium marshallae sp. nov.

urn:lsid:zoobank.org:act:9C826FB6-7885-4390-AF45-A6E5215FA683

Figs 6A , 7C , 8C

Diagnosis

Easily confused with C. globulum sp. nov., but C. marshallae sp. nov. is a little smaller, more coarsely sculpted insect, the elytra in particular more distinctly foveolate.

Etymology

Named after the collector, Jane Marshall.

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 ; comp 5, alluvial forest litter; BMNH.

Paratype MALAYSIA-BORNEO • 1 spec. (mounted disarticulated on the slide); same data as for holotype; BMNH .

Description

SIZE. Habitus ( Fig. 6A ), length 0.58 mm.

COLOUR. Dark brown, antennae, legs and pubescence yellow.

HEAD. Distance across eyes 0.19 mm; antennomeres III–XI, length 0.29 mm; mentum widest anteriorly, anterior margin curved.

PRONOTUM. Length 0.16 mm, width 0.26 mm, foveolate throughout, foveolae forming short longitudinal depressions at base, side margins sinuate, hind angles right angled ( Fig. 7C ).

ELYTRA. Length 0.40 mm, width 0.35 mm, foveolate throughout, evenly rounded, broadest at middle.

VENTRUM. Mesoventrum without pubescence, humeri with sharply projecting angles, lateral margins rounded to mesocoxae with ¾ serrations, keel broad, parallel sided until narrowing sharply between mesocoxae ( Fig. 8C ). Metaventrum with scattered pubescence on the disc, 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.