- thrusts.
Relative to oxycones,
serpenticones take less
effort to
rotate around the
transverse axis (pitch).
Serpenticone ammonites resemble coiled snakes...
- as
genus Badouxia had weak
ventral chevron. S**** is planulate, or
serpenticone.
Sutures were
often asymmetrical and in some genera,
saddles were phylloid...
-
Early Jur****ic.
Ammonites belonging to this
family are
characterised by
serpenticone s**** with a keel,
which can be
surrounded by
grooves if a
species is...
- but just as a
synonym of Prodactylioceras.
Ammonites of this
genus had
serpenticone planulate s**** with
mostly single ribs and no tubercules.
Whorl section...
- Dactylioceratinae.
Ammonites with depressed, cadicone, or even evolute,
serpenticone s****.
Tubercules might be present. Ribs can be both single, or bifurcating...
- Quebec. S**** of
Gasconsoceras are
rapidly enlarging gyrocones and
serpenticones covered by fine
transverse and
longitudinal striae and
prominent dorsal...
- perisphinctids. S**** may be
either evolute or involute.
Ammonites with evolute,
serpenticone to
cadicone s**** with ribs,
sometimes with tubercules.
Members of this...
-
compressed cyrtoconic brevicones. More
advanced forms include gyrocones,
serpenticones, torticones, and
elongate orthocones and cyrtocones,
reflective of the...
-
morphology (based on
Sphenodiscus lobatus and S. lenticularis), the
serpenticone morphology (based on
Dactylioceras commune), the
sphaerocone morphology...
