A revision of Cissidium Motschulsky (Coleoptera: Ptiliidae) with seventy seven new species Author Darby, Michael text European Journal of Taxonomy 2020 2020-04-02 622 1 188 journal article 22458 10.5852/ejt.2020.622 9cb3ea96-0ee4-40b4-8006-19b5fed80b46 3777282 9CD3B2CD-F072-4994-8CA9-24145D343401 Cissidium mahleri sp. nov. urn:lsid:zoobank.org:act: FCBA1166-5BB1-496E-B971-2DAB12C75938 Fig. 54 Etymology Named after the collector V. Mahler. Material examined Holotype SRI LANKA • ♀ ; Pidurutalagala ; 2480 m a.s.l. ; 18 Dec. 1979 ; V. Mahler leg.; MMUE . Fig. 54. Cissidium mahleri sp. nov. A . Habitus. B . Pronotum, × 630. C . Mesoventrite showing median process of collar, mid-keel and keel, × 545. Description SIZE. Habitus ( Fig. 54A ), length 0.61 mm . COLOUR. Yellow. HEAD. With a shallow median fovea between the eyes, width across eyes 0.18 mm ; antennomeres missing; mentum and prementum obscured. PRONOTUM. Length 0.14 mm , width 0.25 mm , densely pubescent and foveolate; sides rounded continuing almost parallel-sided to slightly acute hind angles, bordered, the border not continued along the basal margin, medial emargination opposite scutellum sinuous ( Fig. 54B ). ELYTRA. Length 0.42 mm , width 0.34 mm ; densely pubescent and foveolate as pronotum. MESOVENTRITE. Median process of mesoventral collar broad, widening posteriorly; mid-keel short, widenend and effaced anteriorly creating two semi-circular depressions, hind angles rounded not reaching mesocoxal anterior borders, raised slightly before joining keel; keel with ± eight setae from concave foveolae, tapering to bluntly pointed termination posteriad to the interruption point of the mesocoxal margins; mesoventral lateral margins serrate posteriorly; humeri sloping posteriorly, barely toothed ( Fig. 54C ). METAVENTRITE. Length 0.15 mm , setose, disc simple, width across spines 0.09 mm . WINGS. Macropterous. GENITALIA. Female spermatheca slightly pear-shaped. Remarks One of the only two species of Cissidium from Sri Lanka in this group. Distinguished from C. pilosellum sp. nov. by the shorter and broader median extension of the mesoventral collar.