overlaps OBO_REL:part_of (UNDECLARED) opercle Dermal bone that forms the postero-dorsal part of the opercular series. The opercle articulates with the hyomandibula antero-dorsally and with the subopercle ventrally. The opercle is a paired bone. TAO:0000250 The opercle is usually a large, flat bone that may be partially covered by the posterior region of the preopercle. opercles operculare operculum teleost_anatomy opercular flap dermatocranium dorsal hyoid arch opercle-interopercle joint opercular series preopercle-opercle joint hyomandibula-opercle joint dermal bone