Taken primarily from Kozloff, 1987, 1996 p 135 (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 | Interramal cirrus (a downgrowth from the notopodium) curving to the extent that it makes more than 1 complete turn, and thus appearing somewhat spiralled; evertedpharynx with 14 rows of papillae | Aglaophamus rubella subsp. anops |
| 1b | Interramus cirrus not curving to the extent that it makes more than one complete turn, and sometimes scarcely curved at all; evertedpharynx with 22 rows of papillae | 2 |
| 2a | Posterior prostomial antennae bifid; body not over 1.6 cm long | 3 |
| 2b | Posterior prostomial antennae not bifid; body generally more than 1.6 cm long | 4 |
| 3a | Setiger 3 with eyes; fenestrated setae present in all regions of the body | Nephtys cornuta subsp. franciscana |
| 3b | Setiger 3 without eyes; fenestratedsetae absent in the posterior region of the body | Nephtys cornuta subsp. cornuta |
| 4a | Interramal cirri markedly curved, forming a C or a circle | 5 |
| 4b | Interramal cirri not markedly curved, and generally somewhat flattened | 12 |
| 5a | ||
| 5b | ||
| 6a | ||
| 6b | ||
| 7a | ||
| 7b | ||
| 8a | ||
| 8b | ||
| 9a | ||
| 9b | ||
| 10a | ||
| 10b | ||
| 11a | ||
| 11b | ||
| 12a | Interramal cirri appearing first on setiger 5, about as broad as long, and with a small distal prolongation; without a distinctive pigment pattern | Nephtys brachycephala |
| 12b | Interramal cirri appering first on setiger 3, slightly flattened, but generally elongated; with a distinctive pigment pattern (in life), consisting of several dark longitudinal lines on both sides of the midline of each segment | Nephtys ferruginea |