- 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...
-
family Rutoceratidae. The s**** of
Hindioceras is
described as large,
gyroconic, with
about 2 volutions,
whorls being barely in contact. The
inner margin...
-
included in the
derived Tarphycerid family, Uranoceratidae. The s**** is
gyroconic in the
early stage,
becoming straight and more
rapidly expanded in the...
- 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...
-
tarphycerids sensu lato),
distinguished by
mostly cyrtoconic as well as
gyroconic, sepenticontic, and
sinstrally torticonic s**** with large, typically...
- margin. N****auoceras
differs from
Tetragonoceras in that the
latter is
gyroconic with a
subquadrate whorl section and
angular ventral shoulders, but is...
-
genera such as
Hoplocrioceras and Paracrioceras. The
Crioceratidae are
gyroconic,
coiled in a plane,
generally with
space between the
whorls although in...
- planispiral;
whorls compressed,
fairly flat sided,
barely in
contact (sub-
gyroconic);
venter (outer rim) rounded; ribs fine, flexuous,
branching equally in...
