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Introduction

Atlanta inflata is a small species (<1.5 mm shell diameter). The shell is transparent, although the spire is either brown to reddish-brown or violet to light purple due to the coloration of underlying tissues. The keel is tall with a truncate leading edge and a yellowish-brown to brown base. Because of the small maximal shell size, the keel never inserts between the penultimate and last shell whorls. The shell spire is low conical and consists of 4-1/4 to 4-1/2 whorls. The spire whorls possess spiral ridge sculpture that is strongly or moderately well developed in Hawaiian waters, but in east Australian waters can also be weakly developed. In contrast with its counterpart in the Atlantic and Indian Oceans, A. selvagensis, the spire sutures lack coloration and the spire consists of about 1 fewer whorls. Eyes type a, operculum type c, and radula type I. The species occurs only in the Pacific Ocean in tropical to subtropical waters. In Hawaiian waters it ranges vertically from the surface to about 150 m during the day, with a partial migration by the population into the upper 100 m at night.

Diagnosis

  • Maximal shell diameter <1.5 mm
  • Keel tall, with a truncate leading edge
  • Keel base yellowish-brown to brown
  • Keel does not insert between penultimate and last shell whorls
  • Shell spire consists of 4-1/4 to 4-1/2 whorls
  • Spire whorls with evenly-spaced spiral ridges, ranging from weakly to strongly developed
  • Spire sutures shallow and unpigmented
  • Spire coloration either brown to reddish-brown or violet to light purple
  • Eyes type a
  • Operculum type c
  • Radula type I

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