Cissidium brachypterum, 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 : 172-173

Cissidium brachypterum sp. nov.

urn:lsid:zoobank.org:act:407789E3-2648-4253-A802-7554E4F7C5A3

Figs 6K, 108

Etymology

Johnson ms name. Refers to the brachypterous female.

Material examined

Holotype

SOLOMON ISLANDS • ♂; Nggela , Soso; 2 Dec. 1966; no. 21004; P. Greenslade leg.; BMNH.

Paratypes

SOLOMON ISLANDS • 3 ♂♂, 3 ♀♀; same collection data as for holotype; MMUE, BMNH • 1 ♀; Guadalcanal, Popomanasiu ; 5000 ft a.s.l.; Oct. 1965; litter sample 6, no. 20486; P. Greenslade leg.; MMUE • 1 ♀; Mt. Austen ; 11 Mar. 1963; no. 849; P. Greenslade leg.; BMNH • 1 ♀; same collection data as for preceding but 10 Apr. 1963; no. 6415; BMNH • 1 ♀; same collection data as for preceding but 25 Apr. 1963; no. 6289; BMNH • 1 ♂, 2 ♀♀; same collection data as for preceding but Feb.–Mar. 1966; nos 21243/21336; MMUE, BMNH • 1 ♀; same collection data as for preceding but 10 Jul. 1966; ‘road’; no.23465; MMUE .

Additional material

SOLOMON ISLANDS • 1 ♀; Kolombangara , near Kuzi; 50 ft a.s.l.; 8 Sep. 1965; valley litter no. 781- 800; P.N. Lawrence leg.; MMUE • 1 ♀; Russel Is., Yandina ; 15 Aug. 1966; no. 23539; P. Greenslade leg.; BMNH .

Description

SIZE. Habitus ( Fig. 108A), length 0.65 mm.

COLOUR. Yellow brown, head slightly darker, pubescence, legs and antennae dusky yellow.

HEAD. With a shallow linear depression behind the eyes, width across eyes 0.19 mm; antennomeres III– XI 0.29 mm long, III–IX 16 mm long, X–XI 13 mm long; mentum as Fig 4A.

PRONOTUM. Length 0.16 mm, width 0.27 mm, pubescent with a series of ± eight foveolae along the posterior margin, and further foveolae on disc becoming obliterated towards the anterior margin; lateral margins sharply angled then sinuate posteriorly to rectangular hind angles, bordered, the border extending along the posterior margin to the medial emargination ( Fig. 108B).

ELYTRA. Length 0.43 mm, width 0.35 mm, pubescent, length of setae as pronotum, basal half foveolate.

MESOVENTRITE. Medial extension of collar pointed, almost reaching keel; mid-keel very wide anteriorly, narrowing posteriorly, posterior corners almost reaching mesocoxal anterior borders, sharply raised medially before keel; keel with a series of ± four setae tapering to a blunt termination almost level with hind margin of mesocoxae; mesoventral lateral margins serrate in posterior half; humeri toothed ( Fig. 108C).

METAVENTRITE. Length 0.12 mm, width across spines 0.12 mm, sparsely pubescent, disc shallowly impressed; posterior margins of mesocoxal cavities serrate.

WINGS. Male macropterous, female brachypterous, wing hairs being limited to apical region of the membrane.

GENITALIA. Male aedeagus elongate ( Fig. 6K). Female spermatheca globular.

Remarks

Distinguished from the other species in the Solomon Islands group by the anterior width of the mesoventral mid-keel and the length of the keel.