| 1 | Trepan with two sizes of teeth, alternating between 1 large and 3–4 much smaller. Blades of compound chaetae with both teeth similar | Epigamia alexandri (Malmgren, 1867) (5) |
| – | Trepan with three sizes of teeth, alternating between 1 large with 2 of medium size, or between 1 large, 1 small and 1 medium. Blades of compound chaetae with proximal tooth distinctly longer than distal | Epigamia labordai (San Martín & López, 2002) (1, 5) |
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