start stage end stage lepidotrichium Dermal bone that is rod-like, formed and usually contained in a fin membrane, and jointed to or adjacent to distal radials. They are bilaterally paired. Lepidotrichia are formed from paired hemitrichia surrounding actinotrichia. There are usually two more lepidotrichia than distal radials. TAO:0001554 zebrafish_anatomy lepidotrichia fin ray ZFA:0001554 dermal bone unknown adult