Part of the fin consisting of flattened epidermal cells elevated into a keel-like structure. [ http://www.ncbi.nlm.nih.gov/pubmed/15188431 ]
Term information
In frogs (Anura) the outer fin tissue is present only in tadpoles and sometimes during the embryogenesis of species without tadpoles. In salamanders and caecilians tail fins can persist into reproductive maturity.
This class was sourced from an external ontology (amphibian_anatomy). Its definitions, naming conventions and relationships may need to be checked for compatibility with uberon