Subfamily UMBONEINAE Lyssenko & Aliev, 1987

(Fig. 3G)

Umboneidae Lyssenko & Aliev, 1987: 117

TYPE GENUS. — Umbonea Pchelintsev, 1965 (1965: 85) .

TYPE SPECIES. — Nerinea dilatata d’Orbigny, 1852 (1852: 146) .

SUBFAMILY CHARACTERS . — Shells with hollow columella; whorls almost triangular in outline, siphonal notch located on acute extension of aperture. The columellar, parietal and palatal plaits are small. The umbilicus may be covered by a thin lamella.

REMARKS

This group is assigned to the Ptygmatididae because of the typical siphonal portion which protrudes at about 60° into the umbilicus. It has been named Diozoptyxisidae by Pchelintsev (1965). Diozoptyxis Cossmann, 1907 belongs, in fact, to the Campaniloidea (see Kollmann & Peza 1997 a; Kollmann 2005). Ptygmatididae species originally assigned to this family are allocated to the Umboneinae Lyssenko & Aliev, 1987.