Cissidium obscenum, 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 : 153-155

Cissidium obscenum sp. nov.

urn:lsid:zoobank.org:act:

Figs 7E, 97

Etymology

Johnson ms name (as obscoenum) from the Latin adjective ‘ obscenus ’ and probably relating to the large size.

Material examined

Holotype

PERU • ♂; “E PERU ”, road from Tarapoto to Yurimagua; forest litter on mountain slope; H. Franz leg.; MMUE.

Description

SIZE. Habitus ( Fig 97A), length 1.00 mm.

COLOUR. Yellow brown, shining, antennae, legs and pubescence dusky yellow.

HEAD. Without a clear transverse depression behind the eyes; width across eyes 0.27 mm; antennomeres III–XI length 0.46 mm, III–IX length 0.29 mm, X–XI length 0.17 mm; mentum as Fig. 4A.

PRONOTUM. Length 0.29 mm, width 0.43 mm, pubescent, shallowly foveolate near base; sides sharply angled then almost parallel-sided to rounded rectangular hind angles, front angles rounded, lateral borders continued along the basal margin to the angulate medial emargination opposite the scutellum ( Fig. 97B).

ELYTRA. Length 0.65 mm, width 0.51 mm, pubescent, not foveolate, obliquely truncate.

MESOVENTRITE. Collar with a parallel-sided median extension widening slightly anteriorly and with rounded posterior corners, posterior margin not raised continuing directly into the keel; keel long, with ± six setae, tapering to rounded tip at base of mesocoxae; mesoventral lateral margins rounded, effaced posteriorly without obvious serrations; humeri toothed ( Fig. 97C).

METAVENTRITE. With a setose depression medially, the setae confined to the borders ( Fig. 7E), spines not visible, length 0.16 mm, width between metacoxae 0.12 mm; mesocoxal borders not serrate.

WINGS. Macropterous.

GENITALIA. Male aedeagus long as Fig. 6K but without the terminal hook. Females not known.

Remarks

The three Peruvian species of Cissidium all fall into this group, this is distinguished from the others by its large size.