- s**** is evolute,
early whorls a barrel-shaped cadicone,
later become serpenticonic. Jur****ic of France,
Germany and
Spain Notes Sepkoski, Jack (2002)....
- the
ophidioceratid genus Ophioceras. The s**** is evolute, discoidal,
serpenticonic;
whorl section rounded,
covered with thick, straight,
close spaced,...
-
Ordovician nautiloid cephalopod and part of the Tarphycerida. The s**** is
serpenticonic with
whorls touching but not embracing. The
adult body
chamber becomes...
-
lower Jur****ic
ammonite cephalopods,
characterized by evolute,
commonly serpenticonic, s**** that had long body
chambers and
would have had no
stable floating...
- Glenister, 1964)
Tarphyceratidae with
dorsum deeply impressed Tarphyceras:
Serpenticonic,
whorls rounded vantrally and laterally,
deeply impressed dorsally;...
-
Subcollina is a
genus of
evolute to
serpenticonic stephanoceratacean ammonites from the
Middle Jur****ic (Baj) of Mexico,
placed in the
family Spiroceratidae...
