Cissidium lawrencei, 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 : 49-50

Cissidium lawrencei sp. nov.

urn:lsid:zoobank.org:act:58D7A1B0-57CC-4386-8C00-D528528BB002

Fig. 31

Etymology

Johnson ms name, in recognition of the collector, Dr Peter N. Lawrence, specialist in Collembola, and outstanding collector of many new ptiliids in the Solomon Islands.

Material examined

Holotype

SOLOMON ISLANDS • ♂; Guadalcanal, Mt. Gallego ; 2500 ft a.s.l.; 12 Jul. 1965; ridge forest litter; no. 101-130; P. N. Lawrence leg.; BMNH.

Paratypes

SOLOMON ISLANDS • 1 ♀; same collection data as for holotype; MMUE • 1 ♀; Mt. Jonapau ; 3500– 3750 ft a.s.l.; 6 May 1965; no. 18302; P. Greenslade leg.; BMNH • 1 ♂; Guadalcanal, Popomanasiu ; 4500 ft a.s.l.; x.1965, no. 20508, P. Greenslade leg.; MMUE • 1 ♀; San Cristoval, 4 miles up Warahito from R. Pagato; 4 Aug. 1965; forest litter; Isiah and Leone leg.; BMNH • 1 ♀; Guadalcanal, Tambalase ; 4 Sep. 1965; 1500 ft a.s.l.; dry ridge litter; P.N. Lawrence leg.; BMNH • 1 ♂; Guadalcanal, Mt Austen ; 21 Sep. 1965; litter; P. Greenslade leg.; MMUE .

Description

SIZE. Habitus ( Fig. 31A ), length 0.59 mm.

COLOUR. Yellow brown, pubescence and antennomeres slightly paler.

HEAD. With several shallow foveae not forming a distinct linear depression behind the eyes, width across eyes 0.20mm; antennomeres III–XI length 0.36 mm; mentum sides narrowed to base.

PRONOTUM. Length 0.17 mm, width 0.25 mm, base with a series of four foveae on each side, separated medially, smaller foveae anterior to these on the disc; sides rounded, slightly concave posteriad before rectangular hind angles, sides bordered, the border continuing along the entire length of the posterior margin including the emargination opposite the scutellum, as a thin incised line ( Fig. 31B ).

ELYTRA. Length 0.38 mm, breadth 0.33 mm, basal third strongly foveolate.

MESOVENTRITE. Median process of collar pointed; mid-keel widest anteriorly, sides straight to posterior rounded angles which do not reach mesocoxae, mid-keel raised before junction with keel; keel with ± three setae, narrow, parallel, terminating between the mesocoxae; mesoventral lateral margins obtusely angled before one or two shallow serrations before mesocoxae ( Fig. 31C ).

METAVENTRITE. Length 0.13 mm, pubescence very sparse almost entirely confined to lateral borders, width across spines 0.08 mm, disc simple in male, with a distinct medial fovea posteriad to mesocoxae in female as Fig. 7C.

GENITALIA. Male aedeagus as Fig. 6L . Female spermatheca globular.

Remarks

Distinguished from all other species of this group in the Solomon Islands by the rounded lateral margins of the pronotum.

Figures

Fig. 31. Cissidium lawrencei sp. nov. A. Habitus. B. Pronotum, × 475. C. Mesoventrite showing median process of collar, mid-keel and keel, × 665.

Fig. 7. Metaventral and male ventrite examples. A–B. Metaventrite posterior margin to show spines. A. Cissidium riparium sp. nov., × 610. B. Cissidium plaumanni sp. nov., × 970. C–D. Metaventral discs. C. Cissidium greensladei sp. nov., × 455. D. Cissidium insulare sp. nov., × 595. E. Cissidium obscenum sp. nov., × 840. F–G. Terminal male ventrites. F. Cissidium petri Darby, 2015, × 1580. G. Cissidium amboroense Darby, 2015, × 1380.

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.