IUCN threat status:

Not evaluated

Brief Summary

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Introduction

Atlanta californiensis is a moderately small species (shell diameter to 3.5 mm), with a transparent, flattened shell. The spire shape is low conical to globular, consisting of about 3-1/4 whorls, and with clear to light violet or purple sutures. Internal walls of spire partially decalcified. The keel base is orange-brown to red-brown. Eyes type a, operculum type c (monogyre), and radula type I, with sexual dimorphism in maximal width, growth angle, number of tooth rows, and tooth shapes and sizes. In California Current waters, A. californiensis is by far the most abundant (if not the only) species recorded from plankton tows. The geographic distribution of the species is unique among atlantids; it is limited to the Transition Zone faunal province of the North Pacific Ocean.

Diagnosis

A species of Atlanta, belonging to the Atlanta inflata species group, with the following characteristics:

  • Shell size moderately small (to 3.5 mm shell diameter), with a laterally-flattened, transparent shell
  • Spire shape low conical to globular
  • Spire consists of about 3-1/4 whorls and is smooth, lacking surface sculpture
  • Spire suture coloration ranges from clear to light violet or purple
  • Internal walls of spire partially decalcified
  • Keel penetrates between last two shell whorls in shells larger than about 2 mm
  • Keel base orange-brown to red-brown
  • Eyes type a
  • Operculum type c (monogyre)
  • Radula type I, radular size, shape, number of tooth rows, and tooth shapes and sizes sexually dimorphic
  • Geographic distribution restricted to the Transition Zone faunal province of North Pacific Ocean

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