Taken primarily from Kozloff, 1987, 1996 p. 128 (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 2 prostomial antennae | 2 |
| 1b | With 3 prostomial antennae | 3 |
| 2a | With 6 pairs of tentacular cirri | Micropodarke dubia |
| 2b | With 8 pairs of tentacular cirri | Kefersteinia cirrata |
| 3a | With 6 pairs of tentacular cirri (a dark brown species abundant intertidally, especially on muddy sand where there are growths of Ulva, Enteromorpha, and other algae) | Ophiodromus pugettensis |
| 3b | With 8 pairs of tentacular cirri | Podarkeopsis brevipalpa |