os pteroticum

(plural ossa pterotica))

pterotic (the paired, deep, endochondral bone and the superficial dermal bone covering it in Actinopterygii forming the lateral roof of the skull between the parietal and the hyomandibular, covering the ampulla of the horizontal semicircular canal. Also called autopterotic, which is strictly used for the endochondral element. In Amia it is a paired dermal bone carrying a sensory canal and occupying the dorsal side of the otic capsule. Also called squamosal or squamous but this tetrapod bone is not homologous (but see squamosal))