has skeleton appendage fin AAO:0010374 AEO:0001004 An external projection of an aquatic animal as a fish used in propelling or guiding the body[BTO]. BTO:0004649 EFO:0000875 MAT:0000087 MESH:D058500 MIAA:0000087 OpenCyc:Mx4rvVjcBZwpEbGdrcN5Y29ycA Surface structure involved in locomotion.[TAO] Surface structure involved in locomotion.[VSAO] TAO:0000108 This class groups together various structures that may have arisen through convergent evolution, including, for example, the dorsal fin of a cetacean UBERON:0008897 VSAO:0000099 XAO:0000002 ZFA:0000108 fins uberon fin skeleton