FIGURE 13 in New species and records of Scissurellidae and Anatomidae from the Americas (Mollusca: Gastropoda: Vetigastropoda)

FIGURE 13. Anatoma disciformis. Apertural margin broken at base of columella, giving false impression of subquadratic shape (see remarks). White area in aperture is charging artifact in electron beam. 121 m, off SE side Semisopochoi Island, Rat Islands, Alaska, USA, 51.889 ˚ N, 179.760 ˚ W (LACM 86 - 322, 1). Scale bar shell = 1 mm. Scale bar protoconch = 100 µm