Key:  Family Columbellidae

Phylum Mollusca
  Class Gastropoda
    Subclass Prosobranchia
      Order Neogastropoda
        Suborder Rachiglossa

Taken primarily from  Kozloff, 1987, 1996 p. 226  (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)
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1a  Spiral ridges and grooves limited to the lower portion of the body whorl 2
1b Spiral ridges and grooves not limited to the lower portion of the body whorl 5
2a
2b
3a
3b
4a
4b
5a Axial ridges obviously not parallel to the long axis of the shell (they are directed slightly to the left as they extend downward); height rarely attaining 1.5 cm (often with distinctive light and dark markings unless the shell is covered with foreign material Amphissa versicolor
5b Most axial ridges almost parallel to the long axis of the shell 6
6a Middle third of the outer lip of the aperture (in mature specimens, at least 2 cm high) parallel to the long axis of the shell (photo); height to 3 cm; common intertidal and subtidal species Amphissa columbiana
6b Middle third of the outer lip of the aperture (in mature specimens, at least 1 cm high) curved; height to 1.5 cm; subtidal, rare Amphissa reticulata



Taxonomic Levels Represented in This Key:

  Amphissa columbiana



Page created by Dave Cowles, 2007
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