Cissidium globosum Darby, 2015

Darby, Michael, 2020, A revision of Cissidium Motschulsky (Coleoptera: Ptiliidae) with seventy seven new species, European Journal of Taxonomy 622, pp. 1-188 : 114-115

Cissidium globosum Darby, 2015

Figs 2G , 72

Material examined

Holotype

BOLIVIA • ♀; Santa Cruz Dep., Espejillos ; 17°54′04″ S, 63°26′16″ E; 536 m a.s.l.; 1 Dec. 2013; sifting under palms; Winkler app. extrac.; P. Baňař leg.; UASC.

Supplementary description

The following description amplifies the type description of Darby (2015), in particular by adding more details of the meso- and metaventral characters, in order to conform with the entries in the present paper.

SIZE. Habitus ( Fig. 72A ), length 0.61 mm.

COLOUR. Brownish yellow, legs and antennae paler.

HEAD. With a linear depression between the eyes, distance across the eyes 0.19 mm; antennomeres III– XI 0.26 mm long, terminal antennomeres globose ( Fig. 2G ).

PRONOTUM. 0.25 mm wide, 0.17 mm long ( Fig. 72B ).

ELYTRA. 0.41 mm long, 0.35 mm wide, foveolae deeper than those on pronotum. MESOVENTRITE. Medial extension of collar broad; mid-keel with concave lateral margins, the anterior corners wider than the posterior corners which do not reach the mesocoxal anterior borders, shallowly raised before keel with ± six setae from concave foveolae; keel short, pointed, terminating close to rear margin of mesocoxae; lateral margins of mesoventrite without serrations ( Fig. 72C ).

METAVENTRITE. Posterior margins of mesocoxae partially serrate, spines long.

GENITALIA. Female spermatheca globular. Males not known.

Remarks

Separable from the six other Bolivian Cissidium by its small size, the strongly arched median extension of the mesoventral collar and the parallel sided mid-keel.

Figures

Fig. 2. A–B. Mesoventra of two species of Dacrysoma Grebennikov, 2009 to show form of mid-keel and perforation fringed by setae. C–E. Figures to explain use of the terms foveae, distinct foveolae and shallow foveolae in distinguishing the main species groups. C. Distinct foveolae, showing setae arising from the anterior margin of the depressions. D. Foveae and foveolae, showing setae randomly associated with foveae. E. Shallow foveolae, many setae rubbed off, but insertion points marked by punctures with slightly raised circular rims. F–I. Figures to show different forms of antennae. F. Elongate antenna of Cissidium lisae Darby, 2015. G. Globular antennomere of Cissidium globosum Darby, 2015. H. Female and male antennae of Cissidium petri Darby, 2015. I. Abnormal antennomere XI of Cissidium tigrum Darby, 2015.

Fig. 72. Cissidium globosum Darby, 2015. A. Habitus. B. Pronotum. C. Mesoventrite showing median process of collar, lateral margin, mid-keel and keel, × 1000.