Cissidium ikeuchii 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 : 79-80

Cissidium ikeuchii Sawada, 2008

Fig. 50 A–C

Material examined

Paratypes

JAPAN • 4 ♀♀; Honsyu, Mt. Wasamatayama , Nara Pref.; 10 Aug. 1989; R. Ikeuchi and Y. Sawada leg.; YS.

Supplementary description

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

SIZE. Habitus ( Fig. 50A ), length 0.65 mm.

COLOUR. Reddish brown to dark brown, antennae dusky yellow.

HEAD. With a row of indistinctly formed foveolae on a level with the back of the eyes; antennomeres III–XI, length 0.27 mm.

PRONOTUM. Length 0.19 mm, width 0.32 mm, densely foveolate and pubescent throughout; side margins rounded, slightly concave before obtuse hind angles, with a shallowly crenulate border, hind margin without an emargination in front of the scutellum ( Fig. 50B ).

ELYTRA. Length 0.42 mm, width 0.37 mm, pubescent but without foveolae; apex of male elytra strongly sinuate before suture and with two subconical raised areas.

MESOVENTRITE. Median extension of collar broadest anteriorly tapering only very slightly to mid-keel; mid-keel and keel united without extensions to the anterior mesocoxal borders, strongly setose and sculpted, terminating in a point between the mesocoxae; humeri toothed; mesoventral lateral borders smoothly rounded without serrations ( Fig. 50C ).

METAVENTRITE. Sparsely pubescent, length 0.13 mm, width across spines 0.11 mm, disc simple; mesocoxal posterior borders without serrations

GENITALIA. Female spermatheca globular. Male aedeagus as Fig. 6 Fa–b.

Remarks

This is the smallest of the Japanese species and it is unique amongst the species described here in having strongly sinuate and subconical apices to the male elytra.

Figures

Fig. 50. Cissidium ikeuchii Sawada, 2008. A. Habitus. B. Pronotum, × 485. C. Mesoventrite showing median process of collar, mid keel, keel and lateral margin, × 760.

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.