phragmacone

the phragmacone is the chambered portion of a belemnite shell.

scientists discovered a well-preserved phragmacone in the limestone formation.

a septum divides each chamber within the delicate phragmacone.

the fossil exhibits a distinct phragmacone structure typical of orthoconic nautiloids.

marine paleontologists study the growth rings visible on the phragmacone.

gas filled the chambers of the phragmacone to regulate buoyancy.

the long phragmacone aided the creature in maintaining horizontal balance.

geologists identified the strata based on the recovered phragmacone fossils.

a siphuncle runs through the center of the cylindrical phragmacone.

the internal phragmacone is often the only part found during excavation.

museum visitors admired the massive size of the calcified phragmacone.