Cissidium brachypterum Darby 2020, sp. nov.
Creators: name: Darby, Michael
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Ptiliidae
Cissidium
Cissidium brachypterum

description: 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.
description: Published as part of Darby, Michael, 2020, A revision of Cissidium Motschulsky (Coleoptera: Ptiliidae) with seventy seven new species, pp. 1-188 in European Journal of Taxonomy 622 on pages 172-173, DOI: 10.5852/ejt.2020.622, http://zenodo.org/record/3777282