Cissidium seditiosum, 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 : 129-131

Cissidium seditiosum sp. nov.

urn:lsid:zoobank.org:act:5C7FCA79-8952-4E1D-8999-DE7915F58095

Fig. 82

Etymology

Johnson ms name, presumably from the Latin ‘ seditiosus ’, meaning ‘mutinous’ or ‘fractious’.

Material examined

Holotype

JAMAICA • ♂; St. Ann Parish , 2.5 miles S of Moncague; 2250 ft a.s.l.; 3 Apr. 1968; forest floor litter; S. Peck and R. Fiske leg.; parts of antennae missing; FMNH.

Paratype

JAMAICA • ♂; same collection data as for holotype; aedeagus glued to card, antennae missing; MMUE.

Description

SIZE. Habitus ( Fig. 82A ), length 0.83 mm.

COLOUR. Yellow brown, head darker, pubescence, legs and antennae dusky yellow.

HEAD. With a shallow linear depression behind the eyes, width across eyes 0.21 mm; mentum parallelsided; antennomeres III–XI, length 0.39 mm, III–IX length 0.22 mm, X–XI length 0.17 mm. (Note; one antennomere missing, the other missing antennomeres III–IX, X–XI remaining pasted to the card).

PRONOTUM. 0.26 mm long, 0.37 mm wide, densely pubescent, the hairs barely overlapping, and foveolate, without basal foveae; sides rounded, becoming almost parallel to acute hind angles, bordered, the border continuing along the posterior margin to the short and angulate median emargination in front of the scutellum ( Fig. 82B ).

ELYTRA. 0.49 mm long, 0.40 mm wide, pubescent and foveolate contrasting with the pronotum.

MESOVENTRITE. Medial extension of collar short, parallel-sided then becoming effaced; mid-keel parallelsided hind angles with short flat carinae to mesocoxal anterior borders, rising medially with transverse foveolate sculpturing and ± eight setae (missing from holotype) to a point above the keel; keel with ± six setae, short, terminating in a point at the mid-point of the mesocoxae; mesoventral lateral margins evenly rounded, without serrations; humeri toothed ( Fig. 82C ).

METAVENTRITE. Length 0.15 mm, reticulate at sides, depressed disc with crescent-shaped foveolae and mixture of setae and elongate scales, distance across spines 0.12 mm.

WINGS. Apterous.

GENITALIA. Male aedeagus pointed, lateral margins broadening towards tip.

Remarks

Distinguished from C. insulare sp. nov., the only other Cissidium reported from Jamaica, by the acute hind angles of the pronotum.

Figures

Fig. 82. Cissidium seditiosum sp. nov. A. Habitus. B. Pronotum, × 470. C. Mesoventrite showing median process of collar, mid-keel and keel, × 695.