New Ptiliidae (Coleoptera) from Sarawak in the spirit collection of the Natural History Museum, London Author Darby, Michael text European Journal of Taxonomy 2019 2019-04-04 512 1 50 journal article 27392 10.5852/ejt.2019.512 85c6241d-5e5a-4022-945f-e207d31458ef 2628794 urn:lsid:zoobank.org:pub:8DF89CFD-A549-4C69-8FBC-90EC8DEA9A66 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 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. 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.