Key:  Family Callianassidae

Taken primarily from  Kozloff, 1987, 1996 p.404  (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)

An excellent alternate key can be found in Wicksten, 2009 on page 194.
 

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Lower taxonomic level	Main Page	Alphabetic Index	Systematic Index	Glossary

1a	Rostrum bluntly rounded (photo) chela of larger cheliped, when closed, with a conspicuous gap between the dactyl and the clawlike process of the propodus (photo); carpus of smaller cheliped decidedly wider than the merus (photo); common intertidally in muddy sand	Neotrypaea californiensis
1b	Rostrum sharp; chela of larger cheliped, when closed, without a conspicuous gap between the dactyl and the clawlike process of the propodus; carpus of smaller cheliped not much wider than the merus; locally common intertidally and subtidally (to about 50 m) in muddy sand	Neotrypaea gigas

  Neotrypaea californiensis