- 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...
-
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...
-
superfamily Tainocerataceae They are
generally characterized by
cyrtoconic and
gyroconic s****,
commonly with spines, nodes, or frills,
although some included...
-
Nautilus is found.
Trigonoceratoidea are
characterized by open-spiraled,
gyroconic, to closed,
nautiliconic s**** in
which the
Whorl section is quadrate...
-
family Rutoceratidae. The s**** of
Hindioceras is
described as large,
gyroconic, with
about 2 volutions,
whorls being barely in contact. The
inner margin...
-
tarphycerids sensu lato),
distinguished by
mostly cyrtoconic as well as
gyroconic, sepenticontic, and
sinstrally torticonic s**** with large, typically...
-
Lytoceras which has
transverse ribbing and to that of
Pictetia which is
gyroconic (whorls not touching) and more
strongly expanded. Sepkoski, Jack (2002)...
-
Silurian of
North America and
northern Europe (Norway).
Bickmorites has a
gyroconic s****,
coiled such that
whorls are not in contact,
although close. The...
-
living Nautilus,
ranging from
curved (cyrtoconic),
through loosely coiled (
gyroconic), to
tightly coiled forms,
represented by the Rutoceratidae, Tetragonoceratidae...
