Cissidium obscurum, 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 : 120-122

Cissidium obscurum sp. nov.

urn:lsid:zoobank.org:act:88BE9D35-6C14-4FAB-AC3D-633634572195

Fig. 76

Etymology

Johnson ms name, from the Latin adjective ‘ obscurus ’, meaning ‘dark, obscure’.

Material examined

Holotype

PANAMA • ♂; Bocas del Toro, Prov. Almirante, trail to Dam on Nigua Creek ; 31 Mar. 1959; Berlese cortex of hollowed palm stump; H.S. Dybas leg.; FMNH.

Description

SIZE. Habitus ( Fig. 76A ), length 0.71 mm.

COLOUR. Dark brown, shining, antennae, legs and pubescence yellow.

HEAD. With a setose foveolate depression behind the eyes, width across eyes 0.20 mm; antennomeres III–XI length 0.28 mm, III–IX length 0.18 mm, X–XI length 0.10 mm; mentum obscured.

PRONOTUM. Length 0.20 mm, width 0.30 mm, densely pubescent, shallowly foveolate near base; sides evenly rounded to rectangular hind angles, front angles rounded, lateral borders continued along the basal margin to the sinuous medial emargination in front of the scutellum ( Fig. 76B ).

ELYTRA. Length 0.47 mm, width 0.41 mm, densely pubescent, not foveolate.

MESOVENTRITE. Collar with a long tapering median extension; mid-keel parallel-sided posterior angles not reaching mesocoxae, rising slightly at junction with keel; keel with ± six setae, tapering to a point at base of mesocoxae; mesoventral lateral margins smoothly rounded without serrations; humeri toothed ( Fig. 76C ).

METAVENTRITE. Length 0.16, disc simple, width between spines 0.10 mm; margins of mesocoxal cavities serrate.

WINGS. Macropterous.

Remarks

One of the five Panamanian species in this group. Distinguished by the length of the median extension of the mesoventral collar and of the mid-keel which is parallel sided.

Figures

Fig. 76. Cissidium obscurum sp. nov. A. Habitus. B. Pronotum, × 560. C. Mesoventrite showing median process of collar, mid-keel and keel, × 740.