Barrandeocerine Families

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The Barrandeocerina (=Barrandeocerida sensu Flower and Kummel 1950) includes as many as seven families in two separate groups or stocks separately derived from different Tarphyceratids according the Flower (1984) These might be considered as superfamlies. One is based on the Barrandeoceratidae, derived from from the tarphyceratid ''Centrotarphyceras''.  The other is based on the Plectoceratidae based on the tarphyceratid ''Campbelloceras''.  The Barrandeocerina becomes, as did the Barrandeocerida, an invalid taxon. The terms barrandeocerin and for that matter barrandercerid become descriptive adjectives for evolved tarphycerids, with thin walled, primitively tubular, siphuncles.
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The Barrandeocerina (=Barrandeocerida sensu Flower and Kummel 1950) includes as many as seven families in two separate groups or stocks separately derived from different Tarphyceratids according the Flower (1984) These might be considered as superfamlies. One is based on the [[Tarphycerin Families| Barrandeoceratidae]], derived from from the tarphyceratid ''Centrotarphyceras''.  The other is based on the Plectoceratidae based on the tarphyceratid ''Campbelloceras''.  The Barrandeocerina becomes, as did the Barrandeocerida, an invalid taxon. The terms barrandeocerin and for that matter barrandercerid become descriptive adjectives for evolved tarphycerids, with thin walled, primitively tubular, siphuncles.
==Included Families ==
==Included Families ==
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==Discussion==
==Discussion==
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The distinction between the Barrandeoceratidae and Plectoceratidae is well established and the derivation of some, such as the Bickmoritidae and Uranoceratidae from the Barrandeoceraidae can be well argued.  The phylogeny of the remaining is is probalby best thought of as the current idea, a work in progress.  Whether this includes the Ophidioceratidae presently included in the [[Tarphycerina]] but possibly derived instead from Bickmorites should not be overlooked.
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The distinction between the Barrandeoceratidae and Plectoceratidae is well established and the derivation of some, such as the Bickmoritidae and Uranoceratidae from the Barrandeoceraidae can be well argued.  The phylogeny of the remaining is is probalby best thought of as the current idea, a work in progress.  Whether this includes the [[Tarphycerin Families| Ophidioceratidae]] presently included in the [[Tarphycerina]] but possibly derived instead from Bickmorites should not be overlooked.
==References==
==References==
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*Flower, R. H. 1984. Bodeiceras, A New Mohawkian Oxycone, with Revision of the Older Barranceroceratida and Dioscussion of the Status of the Order.  Journal of Paleontology, V. 58, No. 6, pp 1372-1379, Nov.1984.
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*Flower, R. H. 1984. ''Bodeiceras'', A New Mohawkian Oxycone, with Revision of the Older Barranceroceratida and Dioscussion of the Status of the Order.  Journal of Paleontology, V. 58, No. 6, pp 1372-1379, Nov.1984.
*Flower, R. H. 1976. Ordovician Cephalopod Faunas and Their Role in Correlation , pp 523 -552 un Basset, M. G. (ed) , The Ordovician System: proceedings of a Palaeontological Association symposium, Bermingham, Sept  1974.
*Flower, R. H. 1976. Ordovician Cephalopod Faunas and Their Role in Correlation , pp 523 -552 un Basset, M. G. (ed) , The Ordovician System: proceedings of a Palaeontological Association symposium, Bermingham, Sept  1974.
*Flower, R. H. and Kummel, B, 1950. A Classification of the Nautiloidea. Journal of Paleontology, V.24, No. 5, pp 604-616, Sept 1950.
*Flower, R. H. and Kummel, B, 1950. A Classification of the Nautiloidea. Journal of Paleontology, V.24, No. 5, pp 604-616, Sept 1950.

Revision as of 23:50, 17 December 2009

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