Dicharax (?) placenovitas (Minato, 1981)

Pall-Gergely, Barna, Sajan, Sheikh, Tripathy, Basudev, Meng, Kaibaryer, Asami, Takahiro & Ablett, Jonathan D., 2020, Genus-level revision of the Alycaeidae (Gastropoda, Cyclophoroidea), with an annotated species catalogue, ZooKeys 981, pp. 1-220 : 1

Dicharax (?) placenovitas (Minato, 1981)

Cipangocharax placenovitas Minato, 1981: 135-137, figs 1-3.

Cipangocharax placenovitas - Azuma 1982: 12-13; Minato 1988: 17, pl. 2, figs 3, 4; Minato 1993: 1, fig. 6.

Type locality.

"Arakura (Limestone region), Haruno-cho, Agawa-gun, Kochi-ken, Japan".

Material examined.

NSMT-Mo 58918 (holotype).

Remarks.

Protoconch low, smooth, but the last 0.5 whorl of the protoconch was slightly weathered; ca. 24 ribs on R2, well separated and wide near beginning of tube, gradually becoming narrower, and dense towards end of tube; near tube ribs situated very close to each other, some of them overlap with their neighbours; ribs clearly separated at edge of body whorl, but spaces still much narrower than a rib width; no spiral lines visible on R1.

Operculum with a big central nipple on its inner side; however, the outer belt was absent. The columellar margin of the aperture is not sinuated. The aperture forms a connection between the Cipangocharax -type and normal-type aperture.