Eight new species of Ptenidiini and Discheramocephalini (Coleoptera: Ptiliidae) from Ecuador Author Darby, Michael text European Journal of Taxonomy 2020 2020-01-31 599 1 19 journal article 24119 10.5852/ejt.2020.599 2bd2cec3-b699-4d26-8d1a-b08d374fe14d 3659580 1A3606F2-91CC-4414-AE13-8F086D882AF3 Ptenidium (Peruvium) robustum sp. nov. urn:lsid:zoobank.org:act: 74D1C558-2EF0-4AF3-A998-F7E7053 CAD 23 Fig. 2 A–E Etymology Named after the robust appearance of the species. Material examined Holotype ECUADOR • ♂ ; Napo , Cosanga ; 2100 m a.s.l. ; 7 May 2017 ; droplet; J. McClarin leg.; QCAZM . Paratype ECUADOR • 1 ♂ , no data [presumed to be Napo , Cosanga ]; J. McClarin leg.; BMNH . Description SIZE. Habitus length 0.95 mm ( Fig. 2A ). COLOUR. Dark brown/black, shining appearing polished, glabrous, legs dark red/brown, antennae yellow, club markedly darker. HEAD. Smooth, shining, with a small tuft of setae on disc ( Fig. 2E ), width across eyes 0.33 mm ; antennomeres III–XI length 0.26 mm , the two basal segments forming a scape and IX–XI a loosely jointed club; mentum chaetotaxy of usual Ptenidium type , sides rounded and narrower anteriorly, prementum with 5–6 setae; labrum setose with shallow circular depressions. Fig. 2. Ptenidium robustum sp. nov. A . Habitus. B . Lateral (Ba) and dorsal (Bb) views of the aedeagus. C . Mentum and prementum ×725. D . Venter ×400. E . Tuft of setae on the head ×520. PRONOTUM. Length 0.31 mm , width 0.52 mm , broad, widest before rounded hind angles, without setae in lateral margins and foveae on anterior and posterior margins, traces of setae only on posterior margin at angles. ELYTRA. Length 0.61 mm , width 0.52 mm , widest just anterior to middle, leaving only tip of abdomen exposed. SCUTELLUM. Small, triangular, without basal depressions/foveae. PROSTERNUM. Very narrow in front of procoxae, which are separated by parallel-sided keel with distinct longitudinal depression ( Fig. 2D ). MESOVENTRITE. Glabrous, without reticulation; mid keel with depressed medial channel; keel side margins extending posteriorly as carinae meeting side borders of mesocoxal cavities, median area depressed, forming a longitudinal channel; mesoventrite posterior margin almost straight to lateral margins ( Fig. 2D ). METAVENTRITE. Length 0.20 mm , width 0.46 mm , disc with a triangular patch of short setae, anterior margin with raised border before posterior margin of mesocoxal cavities, metepisternal sutures not visible, posterior margin between metacoxae straight, length 0.17 mm , coxae without coxal plates. WINGS. Of usual ptiliid type . MALE GENITALIA. Aedeagus ( Fig. 2 Ba–Bb). FEMALE GENITALIA. Not known. Remarks This species is only likely to be confused with P. gibbosum Darby, 2016 from Bolivia amongst the subgenus Peruvium species which also have a longitudinal depression down the proventral intercoxal keel and the males of which have a small tuft of setae on the head ( Darby 2016c ), but the broad pronotum, shape of the aedeagus and absence of protuberances on the head quickly distinguish it.