| 1 | Spiniger-like compound chaetae modified, with enlarged, spinous shafts and short, triangular blades | Exogone mompasensis Martínez, Adarraga & San Martín, 2002 (1) |
| – | Chaetae not modified | 2 |
| 2 | Simple chaetae and blades of compound chaetae with long, thin spines extending beyond tips | Exogone sorbei San Martín, Ceberio & Aguirrezabalaga, 1996 (1) |
| – | Simple chaetae without these spines | 3 |
| 3 | Blades of falcigers with some long spines, extending beyond distal tooth | Exogone lopezi San Martín, Ceberio & Aguirrezabalaga, 1996 (1) |
| – | Without long spines on falcigers | 4 |
| 4 | Compound chaetae of 2–3 most anterior parapodia with blades very different from the others: very short, unidentate with a long basal spine | Exogone naidina Ørsted, 1845 (1) |
| – | Compound chaetae similar throughout | 5 |
| 5 | Median antenna distinctly longer than lateral antennae | Exogone dispar (Webster, 1879) (1) |
| – | Median antenna small, similar to lateral antennae | Exogone verugera (Claparède, 1868) (1) |
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