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Atlanta frontieri is a moderately large species (shell diameter to 5.5 mm) that is immediately distinguished by an elevated spiral ridge located at the outer edge of the second to fourth spire whorls. The spire shape is unusual; for the third and fourth whorls the spire shape is very low rounded, while the first two whorls form a raised cap. The keel is tall and rounded, inserting between the penultimate and final whorls in shells larger than about 2 mm. Eyes type b. Operculum type b. Radula type II, with the number of tooth rows (44-50) the lowest in the genus Atlanta and moderate sexual dimorphism in the marginal teeth. Recorded from the Indian Ocean and western North Pacific Ocean; vertical distribution unknown.


  • Shell diameter to 5.5 mm
  • Shell spire of 4-1/4 to 4-1/2 whorls
  • Spire shape low rounded (whorls 3 and 4), with inner whorls (1 and 2) forming a raised cap
  • Elevated spiral ridge located on outer edge of the second to most of the fourth spire whorls
  • Keel tall and rounded; inserting between penultimate and final shell whorls in shells larger than about 2 mm
  • Eyes type b
  • Operculum type b
  • Radula type II, with low number of tooth rows (44-50) and moderate sexual dimorphism in the marginal teeth


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