Cissidium basale Motschulsky, 1855

Darby, Michael, 2020, A revision of Cissidium Motschulsky (Coleoptera: Ptiliidae) with seventy seven new species, European Journal of Taxonomy 622, pp. 1-188 : 140-141

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.3795702
persistent identifier	https://treatment.plazi.org/id/039987A1-3899-FF42-2B09-FEE5FACBFC5F
treatment provided by	Valdenar
scientific name	Cissidium basale Motschulsky, 1855
status

Treatment

Cissidium basale Motschulsky, 1855 View in CoL

Figs 3E View Fig , 88 View Fig

Material examined

PANAMA • ♂; Barro Colorado Is ; Berlese leaves and drift among rocks of stream bed; 25 Jan. 1950; H.S. Dybas 8-147 leg.; the specimen also bears a label stating “ Cissidium basale Mots. det C. Johnson 1971 cf with 2 syntypes ”; MMUE .

Supplementary description

SIZE. Habitus ( Fig. 88A View Fig ), length 0.76 mm.

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

HEAD. With a sharp linear depression interrupted medially by a fovea behind the eyes ( Fig. 3E View Fig ), width across eyes 0.23 mm; antennomeres III–XI length 0.49 mm, III–IX length 0.25 mm, X–XI length 0.24 mm; mentum difficult to make out, submentum with two very long setae.

PRONOTUM. Length 0.24 mm, width 0.30 mm, with scattered pubescence on disc and along lateral margins; lateral margins strongly bordered, sharply angled medially, anterior corners obtusely angled, posterior corners rectangular, border on posterior margin obscured laterally and along emargination in front of the scutellum ( Fig. 88B View Fig ).

ELYTRA. Length 0.48 mm, width 0.39 mm, sparsely pubescent, length of setae as pronotum.

MESOVENTRITE. Medial extension of collar pointed; anterior margin of mid-keel wide, tapering with sinuous lateral margins directly to keel, without a clear posterior margin; keel long, parallel-sided with five setae, terminating past the midpoint of the mesocoxae; mesoventral lateral margins effaced; humeri toothed, posterior margins sinuous, long ( Fig. 88C View Fig ).

METAVENTRITE. Length 0.12 mm, width across spines 0.08 mm, with scattered setae, disc simple; posterior margins of mesocoxal borders without serrations.

WINGS. Macropterous.

Remarks

One of the three Panamanian species in this group. Distinguished by the very broad anterior margin of the mesoventral mid-keel together with the short and sharply pointed median extension of the collar.