| Name: | branched caudal fin ray |
|---|---|
| Synonyms: | |
| Definition: | Caudal fin lepidotrichium that is distally branched. |
| Ontology: | Anatomy Ontology [ZFA:0005533] |
| 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] |