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 flavum sp. nov. urn:lsid:zoobank.org:act: A36CD579-8C69-473F-B1FA-2CACDF167FBB Fig. 71 Etymology Johnson ms name, after the yellow colour of the specimen. Material examined Holotype BRAZIL • ♀ ; Tainhas R.G. de Sul ; 1 May 1959 ; specimen mounted as a disarticulated slide; F. Plaumann leg.; FMNH . Description SIZE. Habitus ( Fig. 71A ), length 0.62 mm . COLOUR. Yellow. Fig. 71. Cissidium flavum sp. nov. A . Habitus. B . Pronotum, × 585. C . Mesoventrite showing median process of collar, mid-keel and keel, × 530. HEAD. With a transverse depression behind the eyes, width across eyes 0.19 mm ; mentum and prementum obscured; antennomeres III–XI length 0.31 mm , III–IX length 0.19 mm , X–XI length 0.12 mm globular. PRONOTUM. Length 0.17 mm , width 0.27 mm , pubescent, without foveolae and foveae; lateral margins shallow angled, narrowly bordered, the borders extending along the posterior margin to the angulate medial emargination opposite the scutellum, hind angles sharp, acute ( Fig. 71B ). ELYTRA. Length 0.42 mm , width 0.35 mm , pubescent, setae same length as pronotum, without foveae and foveolae. MESOVENTRITE. Collar with tapering medial extension; mid-keel narrow, anterior corners almost obliterated before reaching collar, posterior corners not joining mesocoxal anterior borders, raised at junction with keel; keel with ± nine setae, broad at base and tapering to bluntly pointed termination at mesocoxal hind margins; mesoventral lateral margins without clear serrations; humeri toothed ( Fig. 71C ). METAVENTRITE. Length 0.12 mm , sparsely pubescent, disc simple, width across spines 0.08 mm , spines short; posterior margins of mesocoxal cavities without serrations. WINGS. Macropterous. GENITALIA. Female spermatheca globular. Male not known. Remarks One of the three Brazilian species in this group. Distinguished by the pointed median extension of the mesoventral keel together with the partially parallel- sided mid-keel.