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Introduction

Atlanta fragilis is a large species (to 9 mm shell diameter). The shell is transparent and its surface smooth. The shell walls are thin and, as a consequence, the shell is fragile; hence the origin of the specific epithet, fragilis. The keel is tall, with a truncate leading edge, and penetrates between the last two whorls in shells larger than about 4 mm. The keel base is clear, lacking pigmentation. The spire consists of about 3-1/2 whorls and has a moderately-elevated conical shape. Eyes type b, operculum type b, and radula type II. The radula has a limited number of tooth rows (to about 70), and exhibits sexual dimorphism; the marginal teeth are shorter and more sharply bent terminally in males. The species was described from tropical central Atlantic waters, where it is rare in comparison with A. peronii and with which it is closest in shared characteristics. It has not been identified elsewhere; hence it is tentatively regarded as limited to the Atlantic Ocean.

Diagnosis

  • Large species (to 9 mm shell diameter)
  • Shell transparent (including the keel base), with a smooth surface
  • Shell walls thin and fragile
  • Keel tall, inserting between last two whorls in shells larger than about 4 mm
  • Keel base clear, lacking pigmentation
  • Spire consists of about 3-1/2 whorls
  • Spire shape moderately elevated, conical
  • Eyes type b
  • Operculum type b
  • Radula type II
  • Marginal teeth sexually dimorphic; shorter and more sharply bent terminally in male radulae

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