- 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...
-
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...
- Devonian. Some, such as
Aphetoceras and Estonioceras, are
loosely coiled and
gyroconic; others, such as Campbelloceras, Tarphyceras, and Trocholites, are tightly...
-
tarphycerids sensu lato),
distinguished by
mostly cyrtoconic as well as
gyroconic, sepenticontic, and
sinstrally torticonic s**** with large, typically...
-
included in the
derived Tarphycerid family, Uranoceratidae. The s**** is
gyroconic in the
early stage,
becoming straight and more
rapidly expanded in the...
-
genera such as
Hoplocrioceras and Paracrioceras. The
Crioceratidae are
gyroconic,
coiled in a plane,
generally with
space between the
whorls although in...
-
living Nautilus,
ranging from
curved (cyrtoconic),
through loosely coiled (
gyroconic), to
tightly coiled forms,
represented by the Rutoceratidae, Tetragonoceratidae...
-
Naedyceras group comprises three similar and
closely related openly coiled,
gyroconic,
genera within oncocerid family, Brevicoceratidae: Naedyceras, Gonionaedyceras...
-
family Rutoceratidae. The s**** of
Hindioceras is
described as large,
gyroconic, with
about 2 volutions,
whorls being barely in contact. The
inner margin...
