Taken primarily from Kozloff, 1987, 1996 p. 143 (Copyright 1987, 1996, University of Washington Press. Used in this web page by permission of University of Washington Press)
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| Lower taxonomic level | Main Page | Alphabetic Index | Systematic Index | Glossary |
| 1a | With a pair of tentacular cirri on the peristomium | 2 |
| 1b | Without tentacular cirri on the peristomium | Marphysa stylobranchiata |
| 2a | Gills appearing first on setiger 3, with not more than 16 filaments; hooded hooks ventral to the aciculae yellow | Eunice valens |
| 2b | Gills appearing first on setiger 5-7, with as many as 40 filaments; hooded hooks ventral to the aciculae black | Eunice ?aphroditois |