Taken primarily from Kozloff, 1987, 1996 p. 411 (Copyright 1987, 1996, University of Washington Press. Used in this web page by permission of University of Washington Press)
An alternate key to some of these species can be found
in Wicksten, 2009 page 269.
| Jump to: | ||||
| Lower taxonomic level | Main Page | Alphabetic Index | Systematic Index | Glossary |
| 1a | Chelipeds equal or nearly equal, flattened, with a finely granulated surface, not covered with plumose hairs (picture) | 2 |
| 1b | Chelipeds decidedly unequal, thick, roughened by tubercles (picture), and covered with plumose hairs | 3 |
| 2a | Carpus of chelipeds about twice as long as wide, with parallel anterior and posterior margins | Petrolisthes eriomerus |
| 2b | Carpus of chelipeds about 1.5 times as long as wide, with anterior and posterior margins not parallel | Petrolisthes cinctipes |
| 3a | Telson with 7 plates; carpus of chelipeds with 3 or 4 uneven, serrated teeth on the anterior margin | Pachycheles pubescens |
| 3b | Telson with 5 plates, carpus of chelipeds with a broad, nearly triangular lobe on the anterior margin (picture) | Pachycheles rudis |
Pachycheles pubescens
Pachycheles rudis
Petrolisthes cinctipes
Petrolisthes eriomerus
