| 1 | Aciculae not enlarged. Blades of compound chaetae with distinct hoods | Streptosyllis nunezi Faulwetter, Vasileiadou, Papageorgiou & Arvanatidis, 2008 (18) |
| – | Aciculae of some anterior segments enlarged. Blades of compound chaetae without hoods | 2 |
| 2 | Compound chaetae with indistinctly bidentate blades. Enlarged aciculae in chaetigers 2–5 | Streptosyllis websteri Southern, 1914 (1) |
| – | Compound chaetae with distinctly bidentate blades. Enlarged aciculae in chaetigers 2–6 | 3 |
| 3 | Blades of compound chaetae with both teeth similar and close to each other. Aciculae of chaetiger 7 only slightly more slender than those of chaetiger 6 | Streptosyllis bidentata Southern, 1914 (1) |
| – | Blades of compound chaetae with proximal teeth longer and well separated. Aciculae of chaetiger 7 distinctly more slender than those of chaetiger 6 | Streptosyllis campoyi Brito, Núñez & San Martín, 2000 (1) |
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