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Carpocanium kinugasense Nishimura, 1990

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Shell ovate, 89 — 93 um in width and 111 — 114 um in length. Cephalis cap-shaped. Ratios of width and length between cephalis and thorax 1:3 and 1:4, respectively. Cephalic pores variable in size, circular and scattered. Thoracic pores circular and forming 18 to 20 vertical rows. Shell wall smooth in earliest stage of shell growth. About 10 lirae from thoracic pores extended downwards being gradually conspicuous. Cephalic wall has many dimples between pores. Thoracic wall becomes smooth in most mature specimens. Peristome thick, long and flared.

Ovate shell without stricture. Cephalis large and cap-shaped. Peristome slightly flared. Shell wall with many dimples.

This species differs from Carpocanium acephalum, C. vercundum and C. cingulatum in lack of distinct feet and having a flared peristome. The name is derived from Kinugasa Town, Kanagawa Prefecture, where the type specimen was yielded.

Holotype, IGUT HN6047-04, and seven paratypes, IGUT HN6040-01, 6041-01, 6041-02, 6046-01, 6047-01, 6047-02, 6047-03.

Loc. KN, tuffaceous mudstone of the Kinugasa Formation (middle Miocene).
Nishimura 1990











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