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Emarginula dilecta Adams, 1852 Description: Shell almost oval in outline, slightly wider posteriorly. Apex at posterior third, backward pointing and recurved. Anterior slope convex, posterior slope concave. Slit in anterior margin about one-third of anterior slope length, with bordering flanges. Selenizone flat or grooved with raised edges, with erect lunulae. Sculptured with about 40 axial ribs sometimes with a smaller rib between each, crossed by weaker concentric ribs, producing a cancellate surface. Margin crenulate internally. Colour white. Size: Up to 15 mm in length. Distribution: Endemic to Australia: southern NSW to Fremantle, WA. Habitat: Known from dead beach shells, and from living specimens down to 250 m. Rare in NSW. Comparison: Compared to E. candida, this shell is longer and flatter with a longer slit. The selenizone is flat or grooved in this species but is a raised keel in E. candida. Compared to E. bajula, it is taller with more radial ribs. Synonymy: Emarginula amitina Iredale, 1925 Fig. 1 Holotype of Emarginula amitina. East of Ulladulla, NSW, in 135 m (Preserved animal in shell) (C.053775) Fig. 2 a. Broulee, NSW (C.unregistered) b. Ellensbrook, WA (C.unregistered). |
