Cissidium besucheti, 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 : 103-104

Cissidium besucheti sp. nov.

urn:lsid:zoobank.org:act:7F5ED7E5-78EA-4BED-8512-F61581F1569C

Fig. 65

Etymology

Johnson ms name after the collector Claude Besuchet.

Material examined

Holotype

SRI LANKA • ♂; North Central, Alut Oya , river edge on damp sand; 3 Feb. 1970; Mussard, Besuchet and Löbl leg.; MMUE.

Paratypes

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

Description

SIZE. Habitus ( Fig. 65A ), length 0.54 mm.

COLOUR. Dusky yellow.

HEAD. With a barely marked linear depression behind the eyes, width across eyes 0.16 mm; antennomeres III–XI length 0.20 mm, III–IX length 0.12 mm, X–XI length 0.08 mm, constriction in antennomere XI obscured by setae; mentum as Fig. 4A.

PRONOTUM. Densely pubescent; length 0.16 mm, width 0.19 mm, with shallow foveolae in basal half; sides rounded, hind angles obtuse, bordered, the border also on the posterior margin up to the corners of the sinuous emargination opposite the scutellum ( Fig. 65B ).

ELYTRA. Densely pubescent; length 0.34 mm, width 0.24 mm, appearing more parallel-sided than other species, pubescence a little shorter than on pronotum, foveolate.

MESOVENTRITE. Medial extension of collar onto mid-keel parallel-sided, rounded posteriorly; mid-keel margins narrowing anteriorly to join collar extension, posterior margin not reaching anterior margin of mesocoxal borders; keel narrow, tapering to a sharp point below the midpoint of the mesocoxae; mesoventral lateral margins serrate; humeri bluntly toothed ( Fig. 65C ).

METAVENTRITE. Length 0.13 mm, pubescent except in anterior corners, width across spines 0.07 mm, disc simple; posterior margins of mesocoxal cavities not serrate.

WINGS. Macropterous.

GENITALIA. Male aedeagus as Fig. 6 Ia–b. Female spermatheca not detected in the dissection.

Remarks

One of the only two species of Cissidium from Sri Lanka in this group. Distinguished from C. loebli sp. nov. by its smaller size, shorter antennae, more parallel elytra and paler colouration.

Figures

Fig. 65. Cissidium besucheti sp. nov. A. Habitus. B. Pronotum, × 755. C. Mesoventrite showing median process of collar, mid-keel and keel, × 1140.

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. 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.