Cissidium riparium, 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 : 63-64

Cissidium riparium sp. nov.

urn:lsid:zoobank.org:act:3A299211-20B2-4DD6-9B38-09F2085ADED1

Figs 7A , 40

Etymology

Johnson ms name, after the riparian habitat of the specimen.

Material examined

Holotype

NEW CALEDONIA • ♀; S, Riviere Bleu; H. Franz leg.; MM holotype; MMUE.

Description

SIZE. Habitus ( Fig. 40A ), length 0.58 mm.

COLOUR. Yellow brown, antennae, legs and pubescence yellow.

HEAD. With a shallow linear depression between the eyes; width across eyes 0.19 mm; antennomeres III–XI length 0.31 mm, III–IX length 0.19 mm, X–XI length 0.12 mm; mentum as Fig 4A.

PRONOTUM. Length 0.15 mm, width 0.25 mm, almost glabrous but some scattered pubescence anteriorly and at sides, posterior margin with four large foveae separated medially into two pairs, and two pairs of smaller foveae outside these; lateral margins rounded straightening to almost parallel-sided before the rectangular hind angles, bordered, the border not continuing along the posterior margin, medial emargination in front of scutellum sinuate ( Fig. 40B ).

ELYTRA. Length 0.42 mm, width 0.33 mm with a few scattered setae, appearing glabrous.

MESOVENTRITE. Medial extension of collar very widely based, sharply tapering to a point before raised portion of mid-keel; mid-keel wide, sides concave, the hind angles with carinae reaching to the mesocoxa; anterior borders; keel with ± five setae in basal half tapering to parallel-sided and rounded termination at base of mesocoxae; mesoventral lateral margins serrate in basal half; humeri toothed ( Fig. 40C ).

METAVENTRITE. Sparsely pubescent, disc simple, length 0.14 mm, width between spines 0.11 mm ( Fig. 7A ); posterior margins of mesocoxal cavities serrate.

WINGS. Macropterous.

GENITALIA. Female spermatheca globular. Males not known.

Remarks

Distinguished from other New Caledonian species by the wide anterior margin of the medial collar extension.

Figures

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. 40. Cissidium riparium sp. nov. A. Habitus. B. Pronotum, × 615. C. Mesoventrite showing median process of collar, mid-keel and keel, × 1240.

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.