OBO_REL:part_of (UNDECLARED) transverse radial Endochondral bone, which may be ossified or not in adults, located immediately anteriorly to the pterygiophore series of the anal fin. The structure is usually cylindrical, and its plane of symmetry is transverse to that of pterygiophores and fin rays. Recorded in some Cetopsidae, Clariidae and Austroglanididae (Siluriformes) (De Pinna et al., 2007). TAO:0001697 teleost_anatomy postcranial axial skeleton endochondral bone