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 Ptenidium gruenbergae sp.n. ( Figs. 6 A–J ) Length 0.80 mm . Dark, shining, appearing polished, with very short, barely visible, scattered pubescence. Antennomeres 3–8 length 0.33 mm , Fig. 6B . Head with longer pubescence and a group of much longer setae medially on the anterior margin, the central stouter ones appearing to form a bifid process, Fig. 6E . Width across eyes 0.32 mm . Mentum with rounded lateral margins, Fig. 6G . Pronotum length 0.24 mm , width 0.45 mm , with a small group of setae on the posterior margin at the corners, Fig. 6H ; without any fovea on the anterior and posterior margins. Scutellum with a depression at the anterior corners and a short median keel with rounded margins, Fig. 6J . Elytra length 0.54 mm , width 0.47 mm . Proventral process parallel sided, rounded posteriorly and with a shallow median depression, Fig. 6F . Mesoventral collar and keel, Fig. 6I . Male : aedeagus Figs. 6 Ca/b. Female : spermatheca Fig. 6D . Etymology . Named after the collector Brigitte Grünberg (Berlin). Diagnosis . The only other described species in this subgenus, which is typified by the patches of setae on the pronotal posterior angles and the form of the genitalia, are from Peru . P. gruenbergae can be separated from those by the group of setae on the front margin of the head. 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 ) . Paratypes : 6 examples, same data as holotype ( INBio , BMNH ) .