Key:  Family Petricolidae

Phylum Mollusca
 Class Bivalvia
  Subclass Heterodonta
   Order Veneroida

Taken primarily from  Kozloff, 1987, 1996 p. 282 (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)
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1a  Valves with prominent radial ribs, especially in the anterior one-third; length about 2.5 times the height, burrowing in clay and firm mud (introduced from the Atlantic) Petricola (Petricola) pholadiformis
1b Radial sculpture barely apparent, consisting of closely spaced fine lines (these may be completely worn away); length less than twice the height; nestling in crevices and in burrows originally made by rock-boring bivalves (the shell is generally misshapen, conforming to the limited space in which the animal is living) Petricola (Rupellaria) carditoides

Taxonomic Levels Represented in This Key:

  Petricola (Rupellaria) carditoides

Page created by Dave Cowles, 2006
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