Cissidium okuense Grebennikov, 2009

Darby, Michael, 2020, A revision of Cissidium Motschulsky (Coleoptera: Ptiliidae) with seventy seven new species, European Journal of Taxonomy 622, pp. 1-188 : 60-61

Cissidium okuense Grebennikov, 2009

Fig. 38

Material examined

SEMs of a paratype and photographs of a slide of the holotype

CAMEROON • North West province , Mt and Lake Oku; 6°12.218′ N, 010°27.596′ E; 2200 m a.s.l.; 6 May 2006; V. Grebennikov coll.

Supplementary description

The following amplifies the description of Grebennikov (2009) to conform with the other entries in this paper. It is based on the paratype illustrated in 20 SEM images and a single photograph of a slide given to the author by Grebennikov. This specimen was subsequently destroyed in the SEM, but was also used as the basis for Grebennikov’s short textual description.

SIZE. Habitus ( Fig. 38A ), length 1.03 mm.

COLOUR. Yellow brown.

HEAD. With a shallow median depression between the eyes; width across eyes 0.21 mm; antennomeres III–XI length 0.39 mm, III–IX length 0.20 mm, X–XI length 0.19 mm; mentum as Fig. 4A.

PRONOTUM. Length 0.21 mm, width 0.30 mm, sparsely pubescent, without foveolae but with a row of ± ten foveae along the posterior margin in two groups of five, the outermost two in each group smaller than the others; sides with rounded medial angles, straight to obtuse anterior angles, almost parallelsided to hind angles, bordered, the border not continuing along the posterior margin which has a sinuous emargination opposite the scutellum ( Fig. 38B ).

ELYTRA. Length 0.58 mm, width 0.42 mm, sparsely pubescent and foveolate contrasting with the pronotum.

MESOVENTRITE. Collar with a short, strongly tapering median extension widening posteriorly; mid-keel wide, parallel-sided, the posterior angles with narrow carinae to the mesocoxal anterior borders; keel with a single medial seta, slightly sinuate before termination at interruption point of the mesocoxal borders; mesoventral lateral margins serrate posteriorly; humeri toothed ( Fig. 38C fore-shortened by camera position)

METAVENTRITE. Glabrous, length 0.21 mm, disc simple, width across spines 0.12 mm; mesocoxal posterior borders serrate.

WINGS. Apterous.

GENITALIA. Female spermatheca globular.

Figures

Fig. 38. Cissidium okuense Grebennikov, 2009. A. Habitus. B. Pronotum, C. Mesoventrite (fore shortened by camera position, SEM images provided to me by V. Grebennikov)

Fig. 4. Menta and submenta. A. Cissidium petri Darby, 2015, × 1380. B. Cissidium tigrum Darby, 2015, × 1220. C. Cissidium amboroense Darby, 2015, × 1260. D. Cissidium losbanos sp. nov., × 1100. E. Cissidium triangulum Darby, 2019, × 650. F. Cissidium pilosellum sp. nov., × 1420.