| 1 | Aciculae of some anterior parapodia enlarged, with inflated tips (one exception) | Streptosyllis |
| – | Aciculae unmodified, without inflated tips | 2 |
| 2 | Dorsal cirri all smooth, more or less club-shaped | Anoplosyllis |
| – | Dorsal cirri from chaetiger 3 distinctly annulated | Syllides |
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