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 sakaii Sawada, 2008 Fig. 112 Material examined Paratypes JAPAN • 1 ♂ ; Mt. Saragamine , Ehime Pref. ; 29 May 1993 ; M. Sakai leg.; YS • 1 ♂ ; Kama , Yamaguchi Pref. ; 8 Aug. 1999 ; Y. Nishikawa leg.; BMNH • 1 ♂ ; Shirasuna , Komatsujima City , Tokushima Pref. ; 4 Nov. 1993 ; M. Sakai leg. ( BMNH ); 1♂ , Fall of Hiji , Kunigami-son, Okinawa Pref., 13 Apr. 1996 , H. Hoshina leg.; YS . Supplementary description The following description amplifies the type description of Sawada (2008) in order to conform with the entries in the present paper. SIZE. Habitus ( Fig. 112A ), length 0.69 mm . COLOUR. Reddish brown, antennae, legs and pubescence dusky yellow. antennomeres III–XI 0.31 mm long. HEAD. With a shallow uninterrupted transverse depression behind the eyes, width across the eyes 0.20 mm . PRONOTUM. Length 0.18 mm , width 0.29 mm , sparsely pubescent, foveolate and foveate in basal half, the foveae being almost the same size as the foveolae; side margins rounded to almost parallel-sided, narrowly bordered to slightly acute hind angles, the border continuing along the posterior margin to the sinuate emargination in front of the scutellum ( Fig. 112B ). ELYTRA. Length 0.48 mm , width 0.39 mm , pubescent and foveolate. MESOVENTRITE. Median extension of collar tapering from wide base almost to a point; mid-keel with concave sides, hind angles almost reaching anterior borders of mesocoxae; keel narrow, parallel-sided Fig. 112. Cissidium sakaii Sawada, 2008 . A . Habitus. B . Pronotum, × 580. C . Mesoventrite showing median process of collar, mid-keel, keel and lateral margin, × 505. then tapering to between the mesocoxae; mesoventral lateral borders evenly rounded, serrate in posterior half; humeri toothed ( Fig. 112C ). METAVENTRITE. Without pubescence, length 0.17 mm , distance across spines 0.11 mm , disc simple; mesocoxal posterior borders serrate. GENITALIA. Male aedeagus as Fig. 6 Fa–b but beak more pointed and slightly raised at tip which is not so strongly bent. Females not known. Remarks This is the only Japanese species in this group.