Cissidium globulum 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 : 78-79

Cissidium globulum Darby, 2019

Fig. 49

Material examined

Holotype

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

Paratypes

MALAYSIA • 1 ex., same collection data as for holotype; BMNH • 1 ex.; Sarawak, on Mulu NP, limestone forest ; 200 m a.s.l.; 1978; pitfalls; N.M. Collins leg.; BMNH • 3 ex., Sarawak, 4 th division, on Mulu NP; May–Aug. 1978; limestone forest litter; P.M. Hammond and J.E. Marshall leg.; BM1978- 49; BMNH; two of the three missing one elytron • 2 ex.; Sarawak, Mulu , limestone forest ; 200 m a.s.l.; 1978; pitfalls; N.M.Collins leg.; BMNH • 1 ex.; Sarawak, 4 th division, on Mulu NP; May–Aug. 1978; base litter on hill [?]; P.M. Hammond and J.E. Marshall leg.; BM1978-49; BMNH • 1 ex.; Sarawak, 4 th division, on Mulu NP; May–Aug. 1978; comp. 5 alluvial forest litter; P.M. Hammond and J.E. Marshall leg.; BM1978-49; 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, in order to conform with the entries in the present paper.

SIZE. Habitus ( Fig. 49A ), length 0.61 mm.

COLOUR. Pronotum and head almost black, elytra dark brown, shining, pubescence, antennae and legs yellow.

HEAD. With a row of indistinctly formed foveolae on a level with the top of the eyes; antennomeres III–XI, length 0.25 mm; mentum and submentum with ± circular foveolae (not always clearly defined) as Fig. 4A.

PRONOTUM. Length 0.19 mm, width 0.29 mm, foveolate throughout, two short carinae at the base very faint, apparently the result of the fusion of several foveolae; side margins angled medially, posterior margin with sinuous emargination in front of the scutellum ( Fig. 49B ).

ELYTRA. Length 0.43 mm, width 0.40 mm, smooth, evenly rounded, broadest at middle, pubescence as pronotum.

MESOVENTRITE. Collar with large medial patches without reticulation, medial extension narrow, sides slightly concave broadening posteriorly; mid-keel sides slightly concave, hind corners not reaching mesocoxal borders; keel tapering to parallel-sided between mesocoxae; mesoventral lateral margins serrate in posterior half; humeri sharply toothed ( Fig. 49C ).

METAVENTRITE. With scattered pubescence, length 0.18 mm, disc simple, width across spines 0.12 mm; mesocoxal posterior borders serrate.

Remarks

Only likely to be confused with C. marshallae in the other four Malaysian species in this group but lacking the pair of linear depressions at the pronotal base in that species

Figures

Fig. 49. Cissidium globulum Darby, 2019. A. Habitus. B. Pronotum, × 450. C. Mesoventrite showing median process of collar, mid-keel, keel and lateral margin, × 470.

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.