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.

Figures

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.

Fig. 108. Cissidium brachypterum sp. nov. A. Habitus. B. Pronotum, × 485. C. Mesoventrite showing median process of collar, mid-keel and keel, × 560.

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.