| 1 | Body densely papillated | Trypanosyllis troll Ramos, San Martín & Sikorski, 2010 (12) |
| – | Body non-papillated | 2 |
| 2 | Medium sized. Without colour pattern. Dorsal cirri short | Trypanosyllis coeliaca Claparède, 1868 (1) |
| – | Large. With colour pattern. Dorsal cirri long | 3 |
| 3 | Thin reddish transverse stripes on anteriormost segments. Some anterior dorsal cirri distinctly thicker and longer than others. Blades of compound chaetae slightly bidentate | Trypanosyllis aeolis Langerhans, 1879 (1) |
| – | Distinct colour pattern of transverse red stripes. Dorsal cirri long and red, all of similar thickness. Blades distinctly bidentate | Trypanosyllis zebra (Grube, 1860) (1) |
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