New Species and Records of Costa Rican Featherwing Beetles (Coleoptera: Ptiliidae) Author Darby, Michael text Zootaxa 2016 4184 1 41 51 journal article 10.11646/zootaxa.4184.1.2 6a80d4c8-9142-43f3-8e2f-ad72423fb244 1175-5326 164467 396B3FCE-089E-4661-A6D0-FE464D4AAA71 Nossidium schuelkei sp. n. ( Figs. 4 A –F, 5 A–E) Length 0.84 mm . Body dark brown covered with grey/yellow overlapping pubescence, legs and antennae dusky yellow, lateral and posterior borders with a sharply defined yellow margin in transmitted light. Antennomeres 3–8 length 0.33 mm , 4–8 elongate, 10,11 globular, Fig. 4D . Width across eyes 0.31 mm . Mentum broadest at anterior margin tapering towards base, two longest setae situated medially on lateral margins, Fig. 5C . Pronotum length 0.24 mm , width 0.50 mm , posterior margin sinuate before the angles. Elytra length 0.56 mm , width 0.53 mm , widest just behind humeri, wings of usual Nossidium type , Fig. 4E . Mesoventral collar reaching onto the humeri with a raised anterior border and a vertically oriented medial ridge, Fig. 5B ; mesoventral keel wide, reaching below the mesocoxae in dorsal view and with a flattened cap rounded anteriorly and with a raised border, closely fitting posteriorly with the metaventrum so as to appear an anterior metaventral process, Fig. 5A . Metaventrum with line of metepisternal suture reaching mesocoxae but not directed posteriad at lateral margins; lateral points on the posterior intercoxal process broadened and flattened towards the base with convex lateral margins, Fig. 5 F. Pygidium with +/– 15 teeth Fig. 5 G. Male : not known. Female : spermatheca Fig. 4 F. Etymology . Named after the collector Michael Schülke of the Museum für Naturkunde, Berlin. Diagnosis . The new species is similar to N. katyae but may be distinguished by its less shining, broader and more rounded form with less posteriorly tapering elytra; by the form of the mesoventral keel which is more rounded anteriorly and with a raised border ( Figs. 5A /B, katyae Fig. 5 F) and by the form of the lateral points on the posterior intercoxal process of the metaventrum which are broader basally and much less sharply pointed ( Fig. 5D , katyae Fig. 5 G) For differences of N. schuelkei and N. katyae with N. pilosellum , see Darby (2015). Type data . Holotype : ♀ , Costa Rica , Osa Peninsula, Road, Bahia Drake to Rincon de Osa , forest and plantations, car net devart, 8.41–42 N 83.29 –40W, 0–400m , 9.x.2012 , 1500–1700 hrs, Schülke & Grünberg ( INBio ) . Paratype : ♀ , same data as holotype ( INBio ) .