Homalopoma tosaense Habe, 1953

(Figures 3–5)

1982 Homalopoma druidi nov. spec.—Ladd: p. 27–28, pl. 36, figs 5–8.

1999 Homalopoma tosaensis (Habe, 1953) —Higo et al.: p. 46.

2001 Leptothyra tosaensis (Habe, 1953) —Higo et al.: p. 17, fig. G198.

2013 Leptothyra tosaensis (Habe, 1953) —Poppe & Poppe:

http://www.conchology.be/?t=27&family= COLLONIIDAE &species= Leptothyra %20 tosaensis 2013 Homalopoma tosaense Habe, 1953 —Rosenberg: http://marinespecies.org/aphia.php?p=taxdetails&id=737892

Material. Anda 2 (1); Anda 6 (1); AndaDeVos (4).

Characterization. Shell turbiniform, robust, H 3.6 mm, W 3.8 mm; P1 smooth, 1.0 whorls, DN 0.15–0.17 mm; P2, 0.3 whorls, with two robust spiral ribs on median-upper part and third basal spiral rib; P/T boundary distinct terminal varix at 1.3 whorls; T sculpture of spiral ribs; additional spiral ribs between uppermost spiral and suture; spiral and axial lirae in interspaces; umbilicus narrow.

Distribution. Apart from the studied material, this species is known from Tosa Bay and southern Kyushu (Japan), East China Sea (Higo et al. 1999), as well as Pliocene deposits of Viti Levu, Fiji (Ladd 1982).

Remarks. Homalopoma druidi (Ladd, 1982) is synonymized here with Homalopoma tosaense Habe, 1953 and Leptothyra tosaensis (Habe, 1953), because of its overall similar conchology. Although the holotype of Homalopoma druidi (Ladd, 1982) has a rather high spire when compared to the holotype of Leptothyra tosaensis (Habe, 1953), its spire height falls well within the range of intraspecific variation observed on the website: http:// www.conchology.be/?t=27&family= COLLONIIDAE &species= Leptothyra %20 tosaensis . It remains unclear whether the species should be assigned to Leptothyra or Homalopoma, as these genera are not well delimited.