Cissidium houailou, 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 : 41-43

Cissidium houailou sp. nov.

urn:lsid:zoobank.org:act:7BE8B0E1-CE58-49E8-AA40-98EA88881FEB

Fig. 26

Etymology

Johnson ms name, after Houailou, a commune in the North Province of New Caledonia where the insect was found. Noun in apposition.

Material examined

Holotype

NEW CALEDONIA • ♀; Col de Hou b. Houailou; 1970; H. Franz leg.; MM holotype; MMUE.

Paratype

NEW CALEDONIA • ♀, same collection data as for holotype; MMUE.

Description

SIZE. Habitus ( Fig. 26A ) length 0.66 mm.

COLOUR. Dark brown, shining, pubescence, antennae and legs paler.

HEAD. With a shallow linear depression interrupted medially by a small foveola behind the eyes, width across eyes 0.22 mm; antennomeres III–XI length 0.37 mm, III–IX length 0.22 mm, X–XI length 0.15 mm; mentum and prementum obscured.

PRONOTUM. Length 0.18 mm, width 0.28 mm, pubescence mainly confined to lateral margins one or two scattered setae on disc, with a row of six shallow foveae along the posterior margin; sides rounded then almost parallel to slightly acute hind angles, border on lateral margins not continued along the posterior margin which has a sinuous emargination opposite the scutellum ( Fig. 26B ).

ELYTRA. Length 0.44 mm, width 0.37 mm, pubescent, foveolate throughout contrasting with the pronotum.

MESOVENTRITE. Collar with a long, pointed medial extension almost reaching to posterior margin of the mid-keel; mid-keel parallel-sided, anterior corners rounded before reaching collar, posterior corners almost reaching mesocoxae, sharply raised at junction with keel; keel with ± three setae, parallel-sided to rounded termination close to base of mesocoxae; mesoventral lateral margins with one or two serrations in posterior half; humeri bluntly toothed ( Fig. 26C ).

METAVENTRITE. Length 0.14 mm, almost glabrous, one or two scattered setae only, disc plain, width across spines 0.12 mm, spines short; posterior margins of mesocoxae without serrations.

WINGS. Macropterous.

GENITALIA. Female spermatheca globular. Males not known.

Remarks

See remarks for C. amieuense sp. nov. Cissidium houailou sp. nov. differs from that species in having a parallel sided mid-keel.

Figures

Fig. 26. Cissidium houailou sp. nov. A. Habitus. B. Pronotum, × 585. C. Mesoventrite showing median process of collar, mid-keel and keel, × 580.