part of part of postcranial axial skeleton endochondral bone urostyle Rodlike caudal bony structure unique to anurans that lies within a compartment formed by the elongated, anteriorly oriented pelvic girdle. The urostyle is formed by the fusion of the coccyx and the hypochord.[AAO] compound centrum In zebrafish, it is composed of preural vertebra 1 and ural centra 1 and 2. The number of ural centra that become fused with preural centrum 1 varies among teleost subgroups. Because of varying developmental origins the urostyle may not be homologous across species.[TAO] AAO:0000732 In teleosts: Anatomical cluster that is the result of fusion of preural centrum 1 with one or more adjacent ural centra[AAO]; Rodlike caudal bony structure unique to anurans that lies within a compartment formed by the elongated, anteriorly oriented pelvic girdle. The urostyle is formed by the fusion of the coccyx and the hypochord[AAO]. compound terminal centrum Grouping with AAO dubious TAO:0000158 compound terminal vertebra XAO:0003080 compound caudal centrum UBERON:0003106 ZFA:0000158 relationship loss: part_of caudal fin skeleton (VSAO:0000167)[TAO] last vertebra In zebrafish, it is composed of preural vertebra 1 and ural centra 1 and 2. The number of ural centra that become fused with preural centrum 1 varies among teleost subgroups. Because of varying developmental origins the urostyle may not be homologous across species. Anatomical cluster that is the result of fusion of preural centrum 1 with one or more adjacent ural centra.[TAO] terminal centrum ultimate vertebra