Ellesmerocerida

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The Ellesmeroceratidae continued to the end of the Lower Ordovician (Canadian), although as a minor contribution to the total cephalopod fauna. Also continuing to the end of the Canadian are the Bassleroceratidae and Protocycloceratidae which have their beginnings in the Gasconadian ellesmeroceratids. The Protocycloceratidae apparently gave rise to the Cyclostomiceratidae in the Late Canadian (Cassinian). All belong to the Ellesmeroceratina, except perhaps the Bassleroceratidae which Rousseau Flower included in the Tarphycerida.  
The Ellesmeroceratidae continued to the end of the Lower Ordovician (Canadian), although as a minor contribution to the total cephalopod fauna. Also continuing to the end of the Canadian are the Bassleroceratidae and Protocycloceratidae which have their beginnings in the Gasconadian ellesmeroceratids. The Protocycloceratidae apparently gave rise to the Cyclostomiceratidae in the Late Canadian (Cassinian). All belong to the Ellesmeroceratina, except perhaps the Bassleroceratidae which Rousseau Flower included in the Tarphycerida.  
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Also, with its beginning early in the Middle Canadian, is the Eothinoceratidae, first of the Cyrtocerinina. ''Eothinoceras'', the sole known genus of the family gave rise in the Late Canadian to ''Bathmoceras'' the sole genus of the Bathmoceratidae which stands as a possible origin of the [[Actinocerida]]., and to the Late Ordovician [[Cyrtocerinidae]]
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Also, with its beginning early in the Middle Canadian, is the Eothinoceratidae, first of the Cyrtocerinina. ''Eothinoceras'', the sole known genus of the family gave rise in the Late Canadian to ''Bathmoceras'' the sole genus of the Bathmoceratidae which stands as a possible origin of the [[Actinocerida]]., and to the Late Ordovician [[Cyrtocerinina|Cyrtocerinidae]]
== Ellesmerocerid Derivatives==
== Ellesmerocerid Derivatives==

Revision as of 22:28, 20 January 2009

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