Cissidium marshallae 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 : 86-87

Cissidium marshallae Darby, 2019

Fig. 55

Material examined

Holotype

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

Paratype

MALAYSIA • 1 ex.; same collection data as for holotype; mounted as a disarticulated slide; BMNH.

Supplementary description

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

SIZE. Habitus ( Fig. 55A ), length 0.58 mm.

COLOUR. Dark brown, antennae, legs and pubescence yellow. HEAD. Distance across eyes 0.19 mm; antennomeres III–XI, length 0.29 mm; mentum as Fig. 4A.

PRONOTUM. Length 0.16 mm, width 0.26 mm, pubescent and foveolate throughout, foveolae forming short, obscure, longitudinal depressions at base; side margins sharply angled, thence concave to rectangular hind angles, bordered, the border continuing along the posterior margin to the medial emargination opposite the scutellum ( Fig. 55B ).

ELYTRA. Length 0.40 mm, width 0.35 mm, pubescent throughout.

MESOVENTRITE. Medial extension of collar narrow, parallel-sided, slightly widened posteriorly; midkeel parallel-sided, hind angles not reaching mesocoxal anterior borders; keel foveolate with ± seven setae, broad basally, tapering to parallel-sided with rounded termination past interruption of mesocoxal borders; mesoventral lateral margins with ¾ serrations; humeri toothed ( Fig. 55C ).

METAVENTRITE. With scattered pubescence, disc simple.

Remarks

Distinguished from the other four Peruvian species in this group by the pair of linear depressions at the pronotal base.

Figures

Fig. 55. Cissidium marshallae Darby, 2019. A. Habitus. B. Pronotum, × 640. C. Mesoventrite showing median process of collar, mid-keel, keel and lateral margin, × 750.

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.