Cissidium dybasi, Darby, 2020

Darby, Michael, 2020, A revision of Cissidium Motschulsky (Coleoptera: Ptiliidae) with seventy seven new species, European Journal of Taxonomy 622, pp. 1-188 : 146-147

publication ID	https://doi.org/ 10.5852/ejt.2020.622
publication LSID	lsid:zoobank.org:pub:9CD3B2CD-F072-4994-8CA9-24145D343401
DOI	https://doi.org/10.5281/zenodo.3795674
persistent identifier	https://treatment.plazi.org/id/3195ABA5-F6E4-40D9-9C2F-F9816155C8F6
taxon LSID	lsid:zoobank.org:act:3195ABA5-F6E4-40D9-9C2F-F9816155C8F6
treatment provided by	Valdenar
scientific name	Cissidium dybasi
status	sp. nov.

Treatment

Cissidium dybasi View in CoL sp. nov.

urn:lsid:zoobank.org:act:3195ABA5-F6E4-40D9-9C2F-F9816155C8F6

Fig. 92 View Fig

Etymology

Named after the late Henry Dybas who did so much to further our knowledge of the Ptiliidae through his work at the Field Museum, Chicago, and who was very encouraging to the present author.

Material examined

Holotype

BRAZIL • ♂; Santa Catarinay , Chapesonisho; Jan. 1958; F. Plaumann leg.; H.F. Dybas #58-36; FMNH.

Description

SIZE. Habitus ( Fig. 92A View Fig ), length 0.66 mm.

COLOUR. Dusky yellow.

HEAD. With a clearly marked foveate depression between the eyes, width across eyes 0.18 mm; antennomeres III–XI length 0.36 mm; mentum and prementum obscured.

PRONOTUM. Length 0.20 mm, width 0.28 mm, shallowly foveolate in basal half, pubescent; lateral margins rounded, then concave to acute hind angles, bordered, border not extending onto the posterior margin which has a sinuous emargination opposite the scutellum ( Fig. 92B View Fig ).

ELYTRA. Length 0.41 mm, width 0.34 mm, pubescent, setae same length as pronotum, without foveolae.

MESOVENTRITE. Medial extension of collar broad; mid-keel lateral margins widening anteriorly before joining collar and defining two large foveae, posterior corners not joining mesocoxal anterior borders, medially with a short, broad, posteriorly rounded, setose termination before the keel, the setae arising from well-marked elongate sculpture; keel tapering to blunt termination between the mesocoxae; mesoventral lateral margins acutely angled, without serrations; humeri bluntly toothed with strongly sloping posterior margins ( Fig. 92C View Fig ).

METAVENTRITE. Sparsely pubescent, with shallow medial depression; posterior margins of mesocoxal borders not serrate.

WINGS. Macropterous.

GENITALIA. Male aedeagus as Fig. 6 View Fig Fa–b. Females not known.

Remarks

One of the five Brazilian species in this group. Separable by the slightly acute angles of the mesoventrite lateral sides and the sharply sloping posterior borders of the humeri.