-
Belemnoids are an
extinct group of
marine cephalopod, very
similar in many ways to the
modern squid. Like them, the
belemnoids possessed an ink sac, but...
- were a stem-group of Decapodiformes:
According to the "
belemnoid root-stock theory",
belemnoids gave rise to
modern coleoids sometime in the Mesozoic,...
- Tertiary.
Although most of
these groups are
traditionally classified as
belemnoids, the
variation among them
suggests that some are not
closely related to...
-
Paleocirroteuthis Vampyron****a
Ceratitid ammonoids late
Nautilida Advanced belemnoids Diplobelids:
Diplobelus Belemnites:
Belemnites Belemnopsis Belemnotheutis...
- (Neocephalopoda or Angusteradulata) is
closer to
modern coleoids, and
includes belemnoids, ammonoids, and many
orthocerid families.
There are also stem
group cephalopods...
-
extinct at the K–Pg boundary.
These included the
ecologically significant belemnoids, as well as the ammonoids, a
group of
highly diverse, numerous, and widely...
-
became the
early Paleozoic equivalent of coleoids. The
early coleoids and
belemnoids adopted a
different approach: the
phragmocone was
retained but became...
-
Paleocirroteuthis Vampyron****a
Ceratitid ammonoids late
Nautilida Advanced belemnoids Diplobelids:
Diplobelus Belemnites:
Belemnites Belemnopsis Belemnotheutis...
- America. A
specimen of a
belemnoid had been
found in Germany,
clearly preserving 10
tentacles as
carbon films,
showing that
belemnoids are
similar to squids...
- "thunderstone" has also been
traditionally applied to the
fossilised rostra of
belemnoids. The
origin of
these bullet-shaped
stones was not understood, and thus...
