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) triangulum sp. nov. urn:lsid:zoobank.org:act: D49B2C8D-87D8-4E05-84A2-F2EB3F324A2C Fig. 4 A–E Etymology Named after the shape of the proventral intercoxal process. Material examined Holotype ECUADOR • ♂ ; Napo , Cosanga , Camp D Mel ; 2100 m a.s.l. ; 3 Mar. 2018 ; dead leaves from crown of felled tree in family Melastomataceae ; J. McClarin leg.; QCAZM . Description SIZE . Habitus length 0.97 mm ( Fig. 4A ). COLOUR. Dark brown/black, dorsum finely punctured throughout with very short pubescence, legs and antennae yellow/brown. HEAD . With shallow point medially on disc near anterior margin, width across eyes 0.28 mm ; antennomeres III–XI length 0.31 mm ; mentum chaetotaxy of usual Ptenidium type , sides strongly rounded to anterior margin, prementum with 5–6 setae. PRONOTUM. Length 0.27 mm , width 0.44 mm , broad, widest before strongly rounded hind angles, without setae in lateral margins and foveae on anterior and posterior margins, posterior margin strongly sinuate at lateral angles, with tufts of setae ( Fig. 4C ). ELYTRA. Length 0.55 mm , width 0.47 mm , shallowly rounded, widest just anterior to middle. SCUTELLUM. Small, triangular, with very small median keel on anterior margin. PROSTERNUM. Very narrow in front of procoxae, which are separated by an elongate, triangularly shaped keel ( Fig. 4E ). MESOVENTRITE. Reticulate, collar extending narrowly onto humeri, forming blunt teeth, medially with three extensions onto mid-keel, which is setose at margins; keel of usual Ptenidium type , with two long setae at base and setose lateral arms extending posteriad to join margins of mesocoxal cavities, mesocoxae not adjacent; mesoventrite posterior margin shallowly curved to lateral margins ( Fig. 4 D–E). METAVENTRITE. Length 0.19 mm , width 0.46 mm , sparsely pubescent but thickened medially at rear margin, distance between metacoxae 0.13 mm , mesocoxal cavities narrowly bordered, metepisternal sutures not visible. MALE GENITALIA . Aedeagus ( Fig. 4 Ba–Bb). FEMALE GENITALIA . Not known. Remarks Description on the basis of a single specimen is considered justified by the triangular shape of the procoxal process, which is different from that in all other species in the subgenus Peruvium described to date.