- the
coleoids (octopus, squid, cuttlefish, and the
extinct belemnites).
Bactritids are
distinguished from the more
primitive nautiloids by the
small size...
-
among the ellesmerocerids, endocerids, actinocerids, orthoceratoids, and
bactritids.
Orthocones existed from the Late
Cambrian to the Late Tri****ic, but they...
-
ammonoids and
coleoids have
traditionally been ****umed to have
descended from
bactritids,
which in turn
arose from straight-s****ed orthoceratoids. The ammonoids...
- Rioceratida. Some
paleontologists have
regarded Bactroceras as an
early bactritid because of its
spherical apex and
ventral siphuncle. However, a more recent...
- Later,
Engeser (1996)
included not only the coleoids, ammonoids, and
bactritids, but also some
orthocerid families: Michelinoceratidae, Sphaerorthoceratidae...
- Cichowolski, Marcela; Rustán, Juan J. (April 2017). "First
report of
Devonian bactritids (Cephalopoda) from
South America:
paleobiogeographic and biostratigraphic...
-
internal conch which looks similar to
external s**** that can be seen in
bactritid, and this
genus probably shows how
external s****
become into internal...
-
Images Bactrites B. sp.
Lowther Island 3
small silicified fragments. A
bactritid.
Lobobactrites L.
ellipticus Young Island and
Lowther Island Numerous...
-
significant in
cephalopod evolution because they may have
given rise to the
bactritids,
which in turn were the
ancestors of
ammonoids and coleoids. The family...
