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Taxonomic information across the Internet

Spionidae Genera key

Please answer each question, then press Analyse.

1 Less than 6 pairs of branchae
2 Gills begin on setiger
3 Prostomium with horns
4 Setiger 4 or 5 enlarged & with modified hooks
5 Prostomium pointed
6 Occipital antenna
7 Posterior notosetae