| Name: | caudal fin |
|---|---|
| Synonyms: | tail, tail fin |
| Definition: | Fin that is the most posterior median fin. It is composed of a complex of three modified centra and modified neural and hemal arches and spines. |
| Ontology: | Anatomy Ontology [ZFA:0001058] |
| Name: | hypural |
|---|---|
| Synonyms: | hyp, hypuralia, hypurals |
| Definition: | Expanded and laterally flattened hemal arches and spines. They support the lepidotrichia of the caudal fin. The hypurals form ventral to the posterior tip of the dorsally-flexed notochord. In zebrafish condensation of the hypurals begins at approximately 6 dpf (4.1 mm NL, notochord length). |
| Ontology: | Anatomy Ontology [ZFA:0000364] |