Cissidium shibatai Sawada, 2008

Darby, Michael, 2020, A revision of Cissidium Motschulsky (Coleoptera: Ptiliidae) with seventy seven new species, European Journal of Taxonomy 622, pp. 1-188 : 163-164

Cissidium shibatai Sawada, 2008

Fig. 103

Material examined

Paratypes

JAPAN • 4 ♀♀; Ryukyus, Mt. Omotodake, Ishigaki Is. Okinawa Pref.; 11 Apr. 1986; S. Nomura leg.; YS, BMNH • 1 ex.; same locality as for preceding; 8 May 1998; Y.Sawada leg.; YS, BMNH • 1 ♀; same locality as for preceding; 2 Aug. 1999, Y. Nishikawa leg.; YS • 1 ♀; Kanpire , Iriomote Is., Okinawa Pref.; 14 Apr. 1986; S.Nomura leg.; YS • 3 ♀♀; Toyokawa Iriomote Is., Okinawa Pref.; 16 May 1994; T. Hanatani leg.; YS, BMNH .

Supplementary description

The following description amplifies the type description of Sawada (2008) in order to conform with the entries in the present paper.

SIZE. Habitus ( Fig. 103A), length 0.75 mm.

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

HEAD. With a deep transverse depression behind the eyes. Distance across the eyes 0.23 mm; antennomeres III–XI 0.33 mm long, III–IX 0.19 mm long, X–XI 0.14 mm long; mentum obscured.

PRONOTUM. Length 0.22 mm, width 0.35 mm, sparsely pubescent, foveolate and with two distinct longitudinal foveae extending from basal margin at corners of the angulate emargination opposite the scutellum; side margins strongly angulate, almost straight to obtuse hind angles, bordered, the border continuing along the posterior margin ( Fig. 103B).

ELYTRA. Length 0.52 mm, width 0.46 mm, pubescence denser than on the pronotum.

MESOVENTRITE. Median process of collar broad, short; mid-keel almost parallel sided slightly wider posteriorly, hind angles with carinae reaching to mesocoxal anterior borders, setose before junction with keel; keel narrow, parallel-sided becoming slightly wider posteriorly between the mesocoxae with ± three setae; mesoventral lateral borders serrate in posterior half; humeri strongly toothed ( Fig. 103C).

METAVENTRITE. Sparsely pubescent, length 0.16 mm, disc simple, distance across spines 0.12 mm; mesocoxal posterior borders serrate.

GENITALIA. Male aedeagus, as Fig. 6 Ia–b but beak bent to a right angle. Female spermatheca U-shaped as Fig. 6E.

Remarks

This is the only Japanese species in this group apart from C. nishikawai . It may be distinguished from that species by the much narrower pronotal base.