Valcouroceratidae

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The Valcouroceratidae were mostly breviconic (short-shelled) oncocerid cephalopods from the Middle to Upper Ordovician. In mature individuals, bladelike lamellae called actinosiphonate deposits developed within the siphuncle (Sweet 1964).
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'''Characteristics''' (from Sweet 1964): Exogastric cyrtocones and brevicones with ventral, actinosiphonate siphuncle; conch changes during ontogeny from compressed to depressed or subtriangular section.
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==Taxonomy==
  [[Oncocerida|<==]]Valcouroceratidae
  [[Oncocerida|<==]]Valcouroceratidae
     |--''Actinomorpha'' Flower 1943 S64
     |--''Actinomorpha'' Flower 1943 S64

Revision as of 01:56, 15 January 2011

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