- The
siphuncle is ventral,
nummuloidal and
contains inwardly radial actinosiphonate deposits.
Walter C. Sweet, 1964.
Nautiloidea - Oncicerida, Treatise...
-
characterized by compressed, exogastric,
cyrtocones with a large,
actinosiphonate,
dorsal siphuncle. The
Paleobiology Database Balashovia entry accessed...
- life, with broad,
slightly inflated segments and continuous, radial,
actinosiphonate, deposits.
While Actinomorpha is a
member of the Oncocerida; Actinoceras...
-
containing actinosiphonate deposits within.
Oonoceras is
similar except for
having a
generally stronger curvature and a simpler, non-
actinosiphonate siphuncle...
-
oblique sutures, and
subventral siphuncles with
simple internal radial actinosiphonate deposits.
Kindleoceras from the
Upper Ordovician of
Ontario differs...
-
flared necks,
thickened rings, and well
developed radial internal actinosiphonate deposits. In
general form
Kindleoceras is
similar to Manitoulinoceras...
-
genera in that the
siphuncle segments are empty,
rather than
being actinosiphonate. List of
nautiloids Sweet. W. C. 1964. Nautiloidea-Oncocerida; Treatise...
-
their oncocerid ancestors in that
their siphuncles contain laminar actinosiphonate deposits.
Bernard Kummel, 1964.
Nautiloidea - Nautilida;
Treatise on...
-
salient branching from the peristome. The
siphuncle has
continuous actinosiphonate deposits.
Walter C. Sweet, 1964.
Nautiloidea -Oncocerida; Treatise...
-
extreme in Kindleoceras. The
siphuncle is
cyrochoanitic with
simple actinosiphonate deposits.
Walter C Sweet, 1964. Nautiloidea-Oncocerida.
Treatise on...