Cissidium subfoveolatum Darby, 2019

Darby, Michael, 2020, A revision of Cissidium Motschulsky (Coleoptera: Ptiliidae) with seventy seven new species, European Journal of Taxonomy 622, pp. 1-188 : 69-71

Cissidium subfoveolatum Darby, 2019

Fig. 44

Material examined

Holotype

MALAYSIA • ♂; Sarawak, 4 th division, on Mulu NP; May–Aug. 1978; comp 5 alluvial forest litter; P.M. Hammond and J.E. Marshall leg.; BM 1978-49; mounted ventral side uppermost; BMNH.

Supplementary description

The following description amplifies the description of Darby (2019) in particular by adding more details of the meso- and metaventral characters, in order to conform with the present paper.

SIZE. Habitus ( Fig. 44A ), length 0.59 mm.

COLOUR. Dark brown, antennae, legs and pubescence yellow. HEAD. Distance across eyes 0.23 mm; antennomeres III–XI, length 0.39 mm; mentum and submentum as Fig. 4C.

PRONOTUM. Length 0.22 mm, width 0.32 mm, sparsely pubescent, with a row of eight foveae along the posterior margin, the four medial ones tending to form two large ones, the outer two smaller; lateral margins rounded, concave before the acute hind angles, rounded anteriorly, bordered, the border not continuing along the posterior margin, medial emargination in front of scutellum sinuous ( Fig. 44B ).

ELYTRA. Length 0.49 mm, width 0.55 mm, pubescent, shallowly foveolate, contrasting with the pronotum.

MESOVENTRITE. Medial process of collar broad, tapering, almost meeting raised portion of mid-keel; mid keel broad, sides parallel, hind angles with carinae to anterior margins of mesocoxal borders; keel broad, parallel-sided, with ± four setae, terminated at interruption of mesocoxal margins; mesoventral lateral margins serrate in posterior half; humeri sharply toothed ( Fig. 44C ).

METAVENTRITE. Length 0.19 mm, sparsely pubescent, disc simple, width across spines 0.15 mm, spines short.

GENITALIA. Not dissected.

Remarks

This is the only species of Cissidium from Sarawak in this group.

Figures

Fig. 44. Cissidium subfoveolatum Darby, 2019. A. Habitus. B. Pronotum, × 485. C. Mesoventrite showing median process of collar, mid-keel and keel, × 455.

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.