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Challengeria xiphodon (p. 1648): Shell circular, nearly spherical, slightly compressed. Peristome on the dorsal corner with a single simple vertical tooth, which is straight, three-sided prismatic, and as long as the shell.  Dimensions: Diameter of the shell 0.1 to 0.13, length of the tooth 0.1 to 0.12, Habitat: Tropical Atlantic, Stations 349 to 352, surface.


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