The tympanic bone is preserved on the right side, though wanting on the left.
In all the other genera of Dasypodinae the tympanic bone is a mere half-ring, loosely attached to the cranium.
The tympanic bone remains permanently distinct, and the anterior boundary of the tympanic cavity is formed by the alisphenoid.
tympanic bone not welded with the periotic, which is usually only attached to the rest of the skull by ligament.
tympanic bone n.
The bony ring in the fetus that develops after birth into the tympanic part of the temporal bone of the skull, partially enclosing the middle ear and supporting the eardrum. Also called tympanic ring.