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 besucheti sp. nov. urn:lsid:zoobank.org:act: 7F5ED7E5-78EA-4BED-8512-F61581F1569C Fig. 65 Etymology Johnson ms name after the collector Claude Besuchet. Material examined Holotype SRI LANKA • ♂ ; North Central , Alut Oya , river edge on damp sand; 3 Feb. 1970 ; Mussard , Besuchet and Löbl leg.; MMUE . Paratypes SRI LANKA • 1 ♂ , 2 ♀♀ ; same collection data as for holotype; 1 ♂ , 1 ♀ mounted verso, latter missing antennae; MMUE , BMNH . Description SIZE. Habitus ( Fig. 65A ), length 0.54 mm . COLOUR. Dusky yellow. HEAD. With a barely marked linear depression behind the eyes, width across eyes 0.16 mm ; antennomeres III–XI length 0.20 mm , III–IX length 0.12 mm , X–XI length 0.08 mm , constriction in antennomere XI obscured by setae; mentum as Fig. 4A. PRONOTUM. Densely pubescent; length 0.16 mm , width 0.19 mm , with shallow foveolae in basal half; sides rounded, hind angles obtuse, bordered, the border also on the posterior margin up to the corners of the sinuous emargination opposite the scutellum ( Fig. 65B ). ELYTRA. Densely pubescent; length 0.34 mm , width 0.24 mm , appearing more parallel-sided than other species, pubescence a little shorter than on pronotum, foveolate. MESOVENTRITE. Medial extension of collar onto mid-keel parallel-sided, rounded posteriorly; mid-keel margins narrowing anteriorly to join collar extension, posterior margin not reaching anterior margin of mesocoxal borders; keel narrow, tapering to a sharp point below the midpoint of the mesocoxae; mesoventral lateral margins serrate; humeri bluntly toothed ( Fig. 65C ). METAVENTRITE. Length 0.13 mm , pubescent except in anterior corners, width across spines 0.07 mm , disc simple; posterior margins of mesocoxal cavities not serrate. WINGS. Macropterous. GENITALIA. Male aedeagus as Fig. 6 Ia–b. Female spermatheca not detected in the dissection. Remarks One of the only two species of Cissidium from Sri Lanka in this group. Distinguished from C. loebli sp. nov. by its smaller size, shorter antennae, more parallel elytra and paler colouration.