Cissidium angulatum, 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 : 138-139

Cissidium angulatum sp. nov.

urn:lsid:zoobank.org:act:0A8C4F42-155C-4326-B4D9-097A0AB57637

Fig. 87

Etymology

Named after the strongly angled lateral margins of the pronotum.

Material examined

Holotype

PANAMA • ♀; B.C.I. [ Barro Colorado Island ]; 7 Dec. 1938; 3cAu FM( HD) #38.6; HD [Henry Dybas] leg.; FMNH.

Paratype

PANAMA • 1 ex., BCI., 21 Jul. 1938; 3cAEu; FM( HD) #38.10; mounted verso; MMUE.

Description

SIZE. Habitus ( Fig. 87A ), length 0.67 mm.

COLOUR. Dark brown, elytra dusky yellow where translucent, pubescence, legs and antennae dusky yellow.

HEAD. With a clearly marked linear depression behind the eyes, width across eyes 0.19 mm; antennomeres III–XI length 0.33 mm, III–IX length 0.22 mm, X–XI length 0.11 mm; mentum narrowed towards base then parallel-sided towards anterior margin, front angles obtuse.

PRONOTUM. Length 0.19 mm, width 0.28 mm, sparsely pubescent length of setae 0.05 mm, without foveae; side margins strongly bordered, sharply angled, border not extending onto posterior margin which has an emargination opposite the scutellum, hind angles acute ( Fig 87B ).

ELYTRA. Length 0.42 mm, width 0.37 mm, sparsely pubescent, length of setae as pronotum. MESOVENTRITE. Medial extension of collar short; mid-keel posterior margin reaching anterior margin of mesocoxal cavities, keel with a series of ± six setae arising from scale-like, overlapping cells then tapering to point between mesocoxae; mesoventral humeri sharply toothed with strongly sinuate posterior border, lateral margins without serrations ( Fig. 87C ).

METAVENTRITE. Length 0.13 mm, width across spines 0.10 mm, with scattered setae and a shallow medial depression, disc simple; posterior margins of mesocoxal cavities serrate.

WINGS. Macropterous.

GENITALIA. Female spermatheca globular. Males unknown.

Remarks

Only likely to be confused with C. dividuum sp. nov. in this group of Cissidium from Panama on dorsal characteristics but distinguished from that species by the longer mesoventral mid-keel and presence of a median extension of the collar.

Figures

Fig. 87. Cissidium angulatum sp. nov. A. Habitus. B. Pronotum, × 590. C. Mesoventrite showing median process of collar, mid-keel and keel, × 1000.