Cissidium impressum, 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 : 43-44

Cissidium impressum sp. nov.

urn:lsid:zoobank.org:act:C0B9A307-ED66-45D0-A2A8-AA1D58461442

Fig. 27

Etymology

Johnson ms name, presumably referring to the appearance of the dorsum.

Material examined

Holotype

AUSTRALIA • ♀; Queensland, Samford, Brisbane ; 7 Aug. 1966; under heap of cut grass in garden; R.A. Crowson leg.; MMUE.

Paratypes

AUSTRALIA • 1 ♀; same collection data as for holotype; mounted verso; MMUE • 1 ex.; Queensland, Tamborine Mt. ; 1970; H. Franz leg.; MMUE .

Description

SIZE. Habitus ( Fig. 27A ), length 0.73 mm.

COLOUR. Yellow brown, shining, pubescence and antennae slightly paler.

HEAD. With a shallow linear depression behind the eyes, width across eyes 0.21 mm; antennomeres III– XI length 0.25 mm, III–IX length 0.13 mm, X–XI length 0.12 mm; mentum as Fig. 4C.

PRONOTUM. Length 0.20 mm, width 0.29 mm, sparsely pubescent, with a row of six foveae in two groups of ± three separated medially; lateral margins rounded then almost parallel to rectangular hind angles, lateral border not running onto the posterior margin which has a sinuous emargination in front of the scutellum ( Fig. 27B ).

ELYTRA. Length 0.49 mm, width 0.38 mm, pubescent, setae same length as pronotum, foveolate, the foveolae more strongly marked in basal half.

MESOVENTRITE. Collar medial extension onto mid-keel widening posteriorly; mid-keel almost parallelsided, posterior corners with short carinae reaching mesocoxal anterior borders, sharply raised at junction with keel; keel narrow, long, with pointed termination slightly below interruptions of mesocoxae; mesoventral lateral margins without serrations; humeri toothed ( Fig. 27C ).

METAVENTRITE. Length 0.13 mm, setose, disc plain, width across spines 0.10mm, posterior margins of mesocoxae serrate.

WINGS. Macropterous.

Remarks

See remarks under C. deanei sp. nov. The large size, broad, partly parallel-sided mesoventral mid-keel and very narrow keel distinguish this species.

Figures

Fig. 27. Cissidium impressum sp. nov. A. Habitus. B. Pronotum, × 505. C. Mesoventrite showing median process of collar, mid-keel and keel, × 860.

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.