-
ribbed rounded whorls. The s**** is evolute,
early whorls a barrel-shaped
cadicone,
later become serpenticonic. Jur****ic of France,
Germany and
Spain Notes...
-
involute ammonoids on the serpenticone-spherocone
spectrum are
termed Cadicones.
Ammonites vary
greatly in the
ornamentation (surface relief) of their...
- the
stephanoceratacean family, Macrocephalitidae.
Inner whorls form a
cadicone (a
barrel shape),
outer become more
compressed and smoother. Ribs are simple...
-
belonging to this
genus have
evolute s**** of
small size.
Inner whorls are
cadicone,
while outer whorls are subquadrate. On
younger whorls, ribs are widely...
-
belonging to this
genus have
small to medium-sized s****.
Coiling is
cadicone to
moderately evolute.
Subcircular whorl section has
convex flanks and...
- be
either evolute or involute.
Ammonites with evolute,
serpenticone to
cadicone s**** with ribs,
sometimes with tubercules.
Members of this
family had...
- fine
ribbing that
includes may secondaries. It
begins as a
barrel shaped cadicone, with an eccentric, more or less
smooth body chamber.
Emileia is included...
-
America and
South America. Form of
their s****
could range from
depressed cadicone to
compressed ellipsocone.
Whorl section is
quadrangular and has flat sides...
- Otoitidae,
which are
characterized by s**** that
begin as barrel-shaped
cadicones but
which become planulate later in life. Body
chambers are
reduced in...
- to have
evolved from Porpoceras.
Ammonites belonging to this
genus have
cadicone s**** with depressed,
rounded whorl section. Some
species have almost...
