приклади
The stapes has neither a columella nor a stapedial foramen.
On most specimens, the very thin columella in the median part of the shell is either broken or missing (probably resorbed).
Sound is conducted through the middle ear via the stapes or columella (both are ear ossicles derived from the hyomandibular).
It appears to be cut from a large bivalve and does not have the twisted shape of a whelk or conch columella .
Higher values mean tube of the shell forms further from the coiling axis, resulting in a wider columella or hollow center
Other
M-translate