- The
phragmocone is the
chambered portion of the s**** of a cephalopod. It is
divided by
septa into camerae. In most
nautiloids and ammonoids, the phragmocone...
- the
phragmocone). The
phragmocone is
usually only
found with the
better preserved specimens.
Projecting forwards from one side of the
phragmocone is the...
- the arms-most to the tip: the tongue-shaped pro-ostra****, the
conical phragmocone, and the
pointy guard. The
calcitic guard is the most
common belemnite...
-
distinctive slit at its
ventral surface and a
ridge on the
dorsal surface. The
phragmocone (internal s****) has a
small protoconch at its tip, and fit into the...
-
Spirula s****
Ventral view; the
siphuncle and the last
septum of the
phragmocone are
visible Swedish botanist Carl
Linnaeus described Nautilus spirula...
- for spirula, they are the only
coleoid cephalopods with a s**** with a
phragmocone divided into
chambers separated by septa. The
pores provide it with buoyancy...
-
specimen in the field;
western South Dakota,
Pierre Shale, Late Cretaceous. Part of the
phragmocone (left) and part of the body
chamber (right) are present....
- by
their septa, the
dividing walls that
separate the
chambers in the
phragmocone, by the
nature of
their sutures where the
septa join the
outer s****...
- main
difference between Boletzkya and
Naefiteuthis is the
length of the
phragmocone at
which time the
living chamber becomes gladius-like and
dominates the...
-
large external s****,
divided into a
narrowing chambered region (the
phragmocone) and a broad, open body
chamber occupied by the
animal in life. The outer...
