Taken primarily from Kozloff, 1987, 1996 p. 121 (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 pairs of tentacular cirri on segment 1, none on segment 2 | 2 |
| 1b | With 3 or 4 pairs of tentacular cirri, some of these on segment 1, the others on 1 or 2 of the succeeding segments | 6 |
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| 6a | With 3 pairs of tentacular cirri on 2 or 3 segments | 7 |
| 6b | With 4 pairs of tentacular cirri on 3 segments (segments 1 and 2 may be fused, however, in which case 3 of the pairs of tentacular cirri will be on what appears to be segment 1) | 8 |
| 7a | Setae beginning on segment 3; dorsal and ventral cirri of parapodia oval or nearly circular, not decidedly elongated; setae of a particular parapodium with blades of unequal length (the middle setae have blades nearly twice as long as the of the upper and lower setae). | Hesionura coineaui subsp. difficilis |
| 7b | Setae beginning on segment 2; dorsal and ventral cirri of parapodia elongated; setae of a particular parapodium with blades of about equal length | Mystides borealis |
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