| Name: | median fin fold |
|---|---|
| Synonyms: | median fin |
| Definition: | Surface structure that will develop into one of the median fins. Extends from dorsal surface of fish, caudal to the 8th somite, to the ventral surface ending at the caudal side of the vent. |
| Ontology: | Anatomy Ontology [ZFA:0000040] |
| Name: | actinotrichium |
|---|---|
| Synonyms: | actinotrichia |
| Definition: | Skeletal element which is a slender, horny, flexible, unsegmented fibril which provide structural support to fin folds or fins. Actinotrichia are translucent, exhibit birefringence (double refraction) and are composed of the scleroprotein elastoidine. |
| Ontology: | Anatomy Ontology [ZFA:0005435] |