Key: Family Cardiidae

Phylum Mollusca
 Class Bivalvia
  Subclass Heterodonta
   Order Veneroida

Taken primarily from  Kozloff, 1987, 1996  (Copyright 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)

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1a  Length about 1.25 times the height, radial ribs faint, though rather broad, and the surface of the shell nearly smooth (length up to 8 cm, but mostly less than 5 cm; subtidal) Serripes groenlandicus
1b Length decidedly less than 1.25 times the height (sometimes just equal to or less than the height); radial ribs pronounced 2
2a Posterior quarter of valves with rather prominent concentric ridges and low radial ribs, so that the sculpture on this part of the shell is very different from that on the rest of the surface, where only the closely spaced radial ribs are distinct Nemocardium (Keenaea) centifilosum
2b Valves without a substantial area in which the sculpture differs from that on the rest of the surface 3
3a Shell as high as or slightly higher than long; height up to about 8 cm; common intertidal and shall subtidal species Clinocardium (Clinocardium) nuttallii
3b Length about equal or slightly greater than the height; height of most species not exceeding 4 cm (but in C. californiense it may nearly reach 7 cm); subtidal 4
4a Length about equal to the height (height up to about 3 cm; with over 50 radiating ribs, these rather delicate) Clinocardium (Clinocardium) blandum
4b Length slightly greater than the height (ribs rather coarse) 5
5a With 32-38 radial ribs; height usually under 4 cm Clinocardium (Clinocardium) ciliatum
5b With 40 or more radiating ribs; height may reach or exceed 4 cm 6
6a Height up to 7 cm; with about 40-45 ribs Clinocardium (Clinocardium) californiense
6b Height up to slightly more than 4 cm; with about 45-50 ribs Clinocardium (Clinocardium) fucanum

Taxonomic Levels Represented in This Key:

Clinocardium (Clinocardium) nuttallii

Page created by Dave Cowles, 2005
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