Discheramocephalus striatus, Darby, 2020

Darby, Michael, 2020, Eight new species of Ptenidiini and Discheramocephalini (Coleoptera: Ptiliidae) from Ecuador, European Journal of Taxonomy 599, pp. 1-19 : 16-17

Discheramocephalus striatus sp. nov.

urn:lsid:zoobank.org:act:37D029E3-05EF-4EA6-9305-EE17CE070185

Fig. 8 A–D

Etymology

Named after the striations on the elytra.

Material examined

Holotype

ECUADOR • ♂; Napo, Cosanga, Camp ; 2100 m a.s.l.; 23 Mar. 2018; flight intercept trap; J. McClarin leg.; QCAZM.

Description

SIZE. Habitus length 0.74 mm ( Fig. 8A ).

COLOUR. Dark brown/black, shining, appearing polished, glabrous, legs and antennae yellow/brown, antennal club darker.

HEAD. With distinctive sculpturing behind eye, including a single linear depression extending across vertex ( Fig. 8C ) and much larger and deeper depression with pair of setae behind eyes; width across eyes 0.20 mm; antennomeres III–XI length 0.26 mm, X–XI forming a distinct club; mentum front angles rounded, then tapering slightly to wide base, prementum wide from side to side but narrow from front to back, with four setae.

PRONOTUM. Length 0.16 mm, width 0.22 mm, sparsely pubescent, with two longitudinal, linear depressions situated medially and two at sides, medial depressions widest basally and flanked by pair of much shorter foveae on each side, outermost ones slightly longer than innermost pair, pronotal lateral margins strongly sinuate posteriorly, widening to posterior angles, lateral margin with two distinct, setae-bearing concave insinuations in front of scutellum ( Fig. 8B ).

ELYTRA. Length 0.51 mm, width 0.33 mm, finely striate throughout, sparsely pubescent, evenly rounded, sutural margins strongly bordered ( Fig. 8E ).

SCUTELLUM. Triangular, with narrow median keel broadest at base and extending to sharp point at apex.

MESOVENTRITE. Collar broad, strongly reticulate, sharply angled posteriad at anterior angles, forming two deep pits and barely extending onto humeri, which are without teeth, without mid-keel, medial, raised extension of collar joining with anterior margin of metaventrite; mesepiventral suture from middle of collar extension to outside of mesocoxae clearly marked ( Fig. 8D ).

METAVENTRITE. Length 0.19 mm (measured to anterior tip of extension between mesocoxae), width 0.26 mm, sparsely pubescent, with wide anterior extension between mesocoxae terminating in blunt point, lateral margins running into mesocoxal cavity borders, marked by two long setae; positions of metepiventral sutures visible as extensions of those on mesoventrite, effaced before reaching posterior margin of metaventrite ( Fig. 8D ).

MALE GENITALIA. Aedeagus ( Fig 8B ).

FEMALE GENITALIA. Not known.

Remarks

The description of this species based on a single specimen is justified because only one other specimen of the genus is known from the country (see preceding species). It is distinguished from D. nigerrimus sp. nov. and all other known Discheramocephalus spp. by the presence of the striae on the elytra.

Figures

Fig. 8. Discheramocephalus striatus sp. nov. A. Habitus. B. Pronotum ×570. C. Side of head ×1520. D. Meso- and metaventra ×460. E. Elytra showing striations and sutural margin ×1120.