Cissidium visendum, 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 : 135-136

Cissidium visendum sp. nov.

urn:lsid:zoobank.org:act:83CA11DD-21D9-49F7-9B48-41BDDBB3FFCD

Fig. 86

Etymology

Named after the Latin adjective ‘ visendus ’, meaning ‘worth seeing’.

Material examined

Holotype

MALAYSIA • ♂; Selangor, Gombak ; FMNH.

No other collection data are present, but it is likely that the specimen was taken in the vicinity of University of Malaya Field Station, by D.H. Murphy (see C. modestum sp. nov.). A determination label in Johnson’s hand stating ‘ adustipenne ’ is attached to the specimen but it is clearly not that species (see C. adustipenne ).

Description

SIZE. Habitus ( Fig. 86A ), length 0.64 mm.

COLOUR. Yellow.

HEAD. With a shallow linear depression behind the eyes; width across eyes 0.20 mm antennomeres III– XI length 0.29 mm, III–IX length 0.15 mm, X–XI length 0.14 mm; mentum as Fig. 4A.

PRONOTUM. Length 0.18 mm, width 0.29 mm, pubescent without foveae; side margins evenly rounded to rectangular hind angles, bordered, border not extending onto posterior margin which has an emargination opposite the scutellum ( Fig. 86B ).

ELYTRA. Length 0.40 mm, width 0.35 mm, pubescent, shallowly foveolate most noticeably in basal area.

MESOVENTRITE. Medial extension of collar long, narrow and parallel-sided, mid-keel tapering seamlessly into parallel-sided keel, setose; keel long, extending past mesocoxal border interruption; humeri barely toothed; mesoventral lateral margins smoothly rounded, without serrations ( Fig. 86C ).

METAVENTRITE. Length 0.12 mm, width across spines 0.08 mm, with a densely setose, almost square, medial depression, the setae stouter than on the rest of the metaventrite; posterior margins of mesocoxal cavities without serrations.

WINGS. Macropterous.

Remarks

Distinguished from C. bilineatum sp. nov., the only other species from Malaya recorded in this group, by the absence of the linear depressions on the pronotum.

Figures

Fig. 86. Cissidium visendum sp. nov. A. Habitus. B. Pronotum, × 555. C. Mesoventrite showing median process of collar, lateral margin, mid-keel and keel, × 362.

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.