Cissidium pilosellum, 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 : 94-95

Cissidium pilosellum sp. nov.

urn:lsid:zoobank.org:act:433CB5E1-67B0-4A5E-AF3B-C58A68CADDE5

Figs 4F , 60

Etymology

Named after the Latin adjective ‘ pilosus ’, meaning ‘hairy’.

Material examined

Holotype

SRI LANKA • ♀; Central , Makgala; 1780–1800 m a.s.l.; 23 Jan. 1970; Musard, Besuchet and Löbl leg.; MMUE.

Paratypes

SRI LANKA • 2 ♂♂, 1 ♀; same collection data as for holotype; 1 ♂ mounted verso; MMUE, BMNH.

Description

SIZE. Habitus ( Fig. 60A ), length 1.00 mm.

COLOUR. Very dark, almost black, antennae, legs and pubescence dusky yellow.

HEAD. Antennomeres III–XI length 0.43 mm, III–IX length 0.20 mm, X–XI length 0.23 mm; width across eyes 0.24 mm; mentum triangular ( Fig. 4F ).

PRONOTUM. Length 0.29 mm, width 0.40 mm, densely covered with long pubescence and foveolae; sides slightly crenulate and angled, straightening before rectangular hind angles and obtuse anterior angles, bordered, the border continuing for a short distance along the posterior margin then recursive, emargination opposite scutellum present only as a slight insinuation ( Fig. 60B ).

ELYTRA. Length 0.59 mm, width 0.45 mm, densely pubescent and foveolate as pronotum. PROVENTRUM. Wide in front of procoxae, with 8 stout setae in two pairs of four.

MESOVENTRITE. Collar with a long parallel-sided median extension; mid-keel short, widest anteriorly, the angles effaced before the rounded (misshapen) hind angles; keel long, with ± eleven setae, tapering to point at base of mesocoxae; humeri sharply toothed ( Fig. 60C ).

METAVENTRITE. Pubescent, disc simple, length 0.17 width between spines 0.11 mm; margins of mesocoxal cavities not serrate.

WINGS. Micropterous.

GENITALIA. Male aedeagus as Fig. 6 Ia–b. Female spermatheca globular.

Remarks

One of the only two species of Cissidium from Sri Lanka in this group. Distinguished from C. mahleri sp. nov. by the longer and narrower median extension of the mesoventral collar.

Figures

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.

Fig. 60. Cissidium pilosellum sp. nov. A. Habitus. B. Pronotum, × 495. C. Mesoventrite showing median process of collar, mid-keel and keel, × 605.

Fig. 6. Figures to show genitalia types. – Spermathecae. A. Cissidium bilineatum sp. nov. B. Cissidium amboroense Darby, 2015. C. Cissidium sawadai Darby, 2015. D. Cissidium arcuatum sp. nov. E. Cissidium murphyi sp. nov. – Aedeagi. F. Cissidium petri Darby, 2015. G. Cissidium clareae sp. nov. H. Cissidium fraternum sp. nov. I. Cissidium tigrum Darby, 2015. J. Cissidium apterum sp. nov. K. Cissidium brachypterum sp. nov. L. Cissidium greensladei sp. nov. M. Cissidium kolombangaricum sp. nov. N. Cissidium mindanao sp. nov.