Cissidium apterum, Darby, 2020

Cissidium apterum View in CoL sp. nov.

urn:lsid:zoobank.org:act:0CF1B47A-22B0-45A8-AE70-F24D484C01C5

Figs 6J View Fig , 107 View Fig

Etymology

Johnson ms name, named after the apterous male.

Material examined

Holotype SOLOMON ISLANDS • ♂; Santa Ysobel, S.E., 1000 Ships Bay, opposite Lilihinia Is. ; 20 Sep. 1965; forest litter; P.N. Lawrence leg.; BMNH.

Paratypes SOLOMON ISLANDS • 1 ♀; Santa Ysobel , same collection data as for holotype; BMNH • 2 ♂♂, 2 ♀♀; NE Tatamba, Raja ; 30 Sep. 1965; forest litter; P.N. Lawrence leg.; MMUE, BMNH • 1 ♂; E Central San Jorge Is. ; 24 Sep. 1965; forest litter; J.P. and P.N. Lawrence leg.; BMNH .

Description

SIZE. Habitus ( Fig. 101A View Fig ), length 0.63 mm.

COLOUR. Dark yellow brown, pubescence, legs and antennae dusky yellow.

HEAD. Without a clearly marked linear depression behind the eyes, width across eyes 0.22 mm; antennomeres III–XI length 0.36 mm, III–IX length 0.20 mm, X–XI length 0.16 mm.

PRONOTUM. Length 0.18 mm, width 0.32 mm, pubescent, base with a series of four or five foveae on each side, these two series separated by distinct space opposite scutellum and with a few scattered, rather large, somewhat irregular foveolae in basal half; side margins sharply angled, concave before rectangular hind angles, sinuous before obtuse anterior angles, strongly bordered, border effaced laterally on posterior margin ( Fig. 107B View Fig ).

ELYTRA. Length 0.47 mm, width 0.37 mm, pubescence as pronotum, basal third sparsely covered with large foveolae.

MESOVENTRITE. Medial extension of collar short, pointed; anterior margin of mid-keel wider than posterior, corners of posterior margin reaching anterior margins of mesocoxal borders; keel sharply raised anteriorly then almost parallel-sided to termination between mesocoxae; mesoventral lateral margins serrate in posterior half; humeri barely toothed, sloping posteriorly ( Fig. 107C View Fig ).

METAVENTRITE. Length 0.12 mm, width across spines 0.12 mm, with scattered setae, female disc simple, male disc depressed medially; posterior margins of mesocoxal cavities serrate.

WINGS. Male macropterous. Female apterous.

GENITALIA. Female spermatheca globular with small accessory knob. Male aedeagus with projecting hooked tip ( Fig. 6J View Fig ).

Remarks

Five of the ten species of Cissidium recorded from the Solomon Islands belong in this group and are difficult to separate on pronotal characters. The genitalia distinguish this species.