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Dichotomous Key/Petromyzonidae
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Petromyzonidae Animalia Animalia Chordata Chordata Vertebrata Vertebrata Petromyzonidae Petromyzonidae
Glossary for this page (all links are to Wikipedia articles)Dorsal fin:Caudal fin:
This is a Dichotomous Key for the Family Petromyzonidae.
1
Dorsal and caudal fin distinction
The dorsal and caudal fins are distinct - Dichotomous Key:Petromyzon
The dorsal and caudal fins are not distinct - #2
2
Depth of dorsal fin notch
Shallow - Dichotomous Key:Ichthyomyzon
Deep - Dichotomous Key:Lampetra