Cissidium robustum, 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 : 65-66

Cissidium robustum sp. nov.

urn:lsid:zoobank.org:act:8AB09488-EE5E-4F80-AAAE-71E8885D9187

Fig. 41

Etymology

Johnson ms name, from the Latin adjective ‘ robustus ’, meaning ‘strong, robust’ and probably referring to appearance of the species.

Material examined

Holotype

SOLOMON ISLANDS • ♂; Guadalcanal, Mt. Austen ; 19 Jun. 1963; no. 6487; P. Greenslade leg.; BMNH.

Description

SIZE. Habitus ( Fig. 41A ), length 0.63 mm.

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

HEAD. With a shallow median depression between the eyes and a narrow linear ridge posterior to this, width across eyes 0.22 mm; antennomeres III–XI, 0.38 mm; mentum obscured.

PRONOTUM. Length 0.18 mm, width 0.28 mm, base with a series of four foveae on each side with slightly wider separation opposite the scutellum, the two inner pairs larger than the outer pair, surface sparsely pubescent without foveolae; sides angulate, convexly narrowed to effaced front angles, concavely narrowed to slightly acute hind angles, sides bordered, the borders not continuing along the posterior margin though there are two short, shallow impressed lines on each side of the median emargination opposite the scutellum ( Fig. 41B ).

ELYTRA. 0.36 mm wide, 0.40 mm long, basal half somewhat closely covered with rather large foveolae contrasting with the pronotum.

MESOVENTRITE. Medial extension of collar very widely based, sharply tapering to raised portion of mid-keel; mid-keel wide, sides concave, the hind angles effaced before mesocoxae; keel with ± five setae in basal half tapering to almost parallel-sided, with a rounded termination at base of mesocoxae; mesoventral lateral margins serrate in posterior half ( Fig. 41C ).

METAVENTRITE. Length 0.15 mm, sparsely pubescent, disc simple, distance across spines 0.11 mm.

WINGS. Macropterous.

GENITALIA. Male aedeagus as Fig. 6 Fa–b, but slightly longer. Females unknown.

Remarks

Distinguished from other Solomon Islands species in this group by the wider mid-keel.

Figures

Fig. 41. Cissidium robustum sp. nov. A. Habitus. B. Pronotum, × 470. C. Mesoventrite showing median process of collar, mid-keel and keel, × 620.

Fig. 6. Figures to show genitalia types. – Spermathecae. A. Cissidium bilineatum sp. nov. B. Cissidium amboroense Darby, 2015. C. Cissidium sawadai Darby, 2015. D. Cissidium arcuatum sp. nov. E. Cissidium murphyi sp. nov. – Aedeagi. F. Cissidium petri Darby, 2015. G. Cissidium clareae sp. nov. H. Cissidium fraternum sp. nov. I. Cissidium tigrum Darby, 2015. J. Cissidium apterum sp. nov. K. Cissidium brachypterum sp. nov. L. Cissidium greensladei sp. nov. M. Cissidium kolombangaricum sp. nov. N. Cissidium mindanao sp. nov.