Dictionary of ichthyologyQUADRATOJUGALquadratojugal: translationa paired dermal bone behind the quadrate, e.g. inLepisosteusand Acipenseridae. It may be an independent ossification, e.g. inSalmoandSyngnathus. Sometimes called interopercle or preopercle from its positionQUADRICUSPIDXANTHOCHROMIC