Genus Anatoma Woodward, 1859

Type species

Scissurella crispata Fleming, 1828, by monotypy.

Key to the species of Anatoma found in the GB (see also Geiger 2012)

1. Last whorl very broad, about 40% of diameter in apical view; suture of last whorl along selenizone or just below it ............................ Anatoma richardi (Dautzenberg & H. Fischer, 1896) (Fig. 7A–I)

– Last whorl less than 35% of diameter in apical view, suture definitely situated at a distance beneath selenizone ......................................................................................................................................... 2

2. Umbilicus wide and deep, its diameter more than 10% of the shell diameter, adapical surface nearly smooth except for growth lines ........................... Anatoma umbilicata (Jeffreys, 1883) (Fig. 9A–E)

– Umbilicus less than 10% of the shell diameter, surface of shell with distinct sculpture of axial riblets and spiral threads .............................................................................................................................. 3

3. Selenizone situated high on the profile, making it stepped; adapical part of the whorl above it forming a shoulder and abapical part below it very convex ... Anatoma eximia (Seguenza, 1880) (Fig. 8D–I)

– Selenizone situated near the middle of the last whorl, not as above ................................................ 4

4. Sculpture of conspicuous axial riblets, profile between suture and selenizone distinctly convex ...... .................................................................................... Anatoma aspera (Philippi, 1844) (Fig. 8A‒C)

– Sculpture of tenuous ribs, profile between suture and selenizone rather flat ...................................... ................................................................. Anatoma corralae Gofas & Luque sp. nov. (Fig. 10A–H)