Taken primarily from Kozloff, 1987, 1996 (Copyright 1987, 1996, University of Washington Press. Used in this web page by permission of University of Washington Press)
An excellent alternate, up to date key can be found in
2009 page 132.
|Lower taxonomic level||Main Page||Alphabetic Index||Systematic Index||Glossary|
|1a||Frontal edge of carapace with an obvious indentation; propodus of cheliped (exclusive of the fixed claw) about as wide as long||Betaeus setosus|
|1b||Frontal edge of carapace slightly convex or nearly straight, definitely without an indentation; propodus of cheliped more than twice as long as wide||Betaeus harrimani|