IUCN threat status:

Not evaluated

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Introduction

Atlanta gaudichaudi is a small species (maximal shell diameter = 3 mm). Shell surface is colorless, although the keel base is yellow-brown or red-brown. The shell spire consists of 3-1/4 to 3-1/2 whorls. Surface of spire whorls lack sculpture except for a small spiral ridge on the outer edge of the whorls. Spire shape is low conical with a helicoid shape (due to rounded whorls and incised sutures). The keel is tall, with a truncate leading edge. The keel does not insert between the penultimate and last shell whorls. Eyes type b. Operculum type b. Radula type I. This species differs from the other two in the A. gaudichaudi species group in that the shell spire lacks raised sculpture and the gyre of the operculum lacks spirally-arranged hooks or spines. The species has a cosmopolitan distribution.

Diagnosis

  • Shell small; maximal diameter = 3 mm
  • Shell colorless and with a smooth surface that lacks raised sculpture, except for a small spiral ridge on the outer edge of the spire whorls
  • Spire low conical, with a helicoid shape that is due to rounded whorls and incised sutures
  • Spire consists of 3-1/4 to 3-1/2 whorls
  • Keel tall, with a truncate leading edge and a yellow-brown or red-brown base
  • Keel does not insert between last two shell whorls
  • Eyes type b
  • Operculum type b
  • Radula type I

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