- range: M
Ordovician -
Silurian Part of the
isolated siphuncle of an
armenoceratid nautiloid cephalopod Scientific classification Domain:
Eukaryota Kingdom:...
-
Monocyrtoceras is a
genus of
armenoceratids (Cephalopoda) from the
Middle Silurian of
North America (Wisconsin), with a
gently curved s**** and a siphuncle...
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Elrodoceras is a
genus of
armenoceratids, (Cephalopoda, Actinocerida), that grew
fairly large,
characterized by a
straight s****,
slightly curved at the...
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Elrodoceras Gonioceratidae, late Mid Ord, N Am.
Gonioceras (from
early Armenoceratid) Ormoceratidae,
Seamann 1853, Ormoceras, Metarmenoceras, Parormoceras...
