- Jur****ic and
Cretaceous ammonites that
produced loosely coiled,
evolute and
gyroconic s**** in
which the
sutural element are said to have
complex moss-like...
- Devonian. Some, such as
Aphetoceras and Estonioceras, are
loosely coiled and
gyroconic; others, such as Campbelloceras, Tarphyceras, and Trocholites, are tightly...
- may have been
cyrtconic to
loosely gyroconic,
coiled without whorls being in
contact with one another.
Gyroconic forms may have had a
subtriangular cross...
-
transition from a
straight s****, to a
curved (cyrtoconic) s**** to a
relaxed (
gyroconic)
spiral and
finally to a
tight spiral. The Kellw****er
Event at the end...
-
cephalopod from the
Middle Canadian Epoch of New York with a
loosely coiled,
gyroconic, s**** in
which the
whorls are not in
contact and the
siphuncle is on...
-
Nautilus is found.
Trigonoceratoidea are
characterized by open-spiraled,
gyroconic, to closed,
nautiliconic s**** in
which the
Whorl section is quadrate...
-
Naedyceras group comprises three similar and
closely related openly coiled,
gyroconic,
genera within oncocerid family, Brevicoceratidae: Naedyceras, Gonionaedyceras...
-
superfamily Tainocerataceae They are
generally characterized by
cyrtoconic and
gyroconic s****,
commonly with spines, nodes, or frills,
although some included...
-
living Nautilus,
ranging from
curved (cyrtoconic),
through loosely coiled (
gyroconic), to
tightly coiled forms,
represented by the Rutoceratidae, Tetragonoceratidae...
- the
United States. Goldringia,
named by
Rousseau Flower in 1945, has a
gyroconic s****,
coiled so as
whorls do not touch. The
cross section is slightly...
