- 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...
-
included in the
derived Tarphycerid family, Uranoceratidae. The s**** is
gyroconic in the
early stage,
becoming straight and more
rapidly expanded in the...
-
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...
-
living Nautilus,
ranging from
curved (cyrtoconic),
through loosely coiled (
gyroconic), to
tightly coiled forms,
represented by the Rutoceratidae, Tetragonoceratidae...
-
Lytoceras which has
transverse ribbing and to that of
Pictetia which is
gyroconic (whorls not touching) and more
strongly expanded. Sepkoski, Jack (2002)...
- 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...
-
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...
