urostyle
urostyle
"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]."