-
flared necks,
thickened rings, and well
developed radial internal actinosiphonate deposits. In
general form
Kindleoceras is
similar to Manitoulinoceras...
-
commonly thin and
structureless but in
certain derived forms may
become actinosiphonate with
inwardly projecting radial lamellae. The
juvenile segments in...
-
strongly contracted T-shaped aperture;
ventral siphuncle containing actinosiphonate deposits, and two rows of
spines on
either side.
Adelphoceras is included...
- a
siphuncle commonly composed of
concave segments and
occupied by
actinosiphonate deposits. Some ten
genera have been
described which lived during the...
-
which the
siphuncle is
generally large, ventral, and with
lamellar actinosiphonate deposits (Flower 1950,
Sweet 1964)
Jovelaniids have a
range that extends...
- gyrocones, brevicones, and torticones. that tend to
develop vestigial actinosiphonate deposits and
subtriangular transverse sections. The Brevicoceratidae...
- life, with broad,
slightly inflated segments and continuous, radial,
actinosiphonate, deposits.
While Actinomorpha is a
member of the Oncocerida; Actinoceras...
- the
Middle Devonian. The
siphuncle is
broadly expanded, and in some
actinosiphonate. The
Acleistoceratidae are
derived from
Oncoceras (Oncoceratidae) through...
-
extreme in Kindleoceras. The
siphuncle is
cyrochoanitic with
simple actinosiphonate deposits.
Walter C Sweet, 1964. Nautiloidea-Oncocerida.
Treatise on...
-
containing actinosiphonate deposits within.
Oonoceras is
similar except for
having a
generally stronger curvature and a simpler, non-
actinosiphonate siphuncle...
