Acleistoceratidae

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The Acleistoceratidae were a Middle Silurian to Middle Devonian family of oncocerid cephalopods characterised by a broad siphuncle. Many species had a constricted triangular aperture.
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The '''Acleistoceratidae''' were a [[Middle Silurian]] to [[Middle Devonian]] family of oncocerid [[cephalopod]]s characterised by a broad siphuncle. Many species had a constricted triangular aperture.
'''Characters''' (from Sweet 1964): Depressed (rarely compressed, at least in early stages) exogastric brevicones and cyrtocones; siphuncle broadly expanded, actinosiphonate in some Devonian species.
'''Characters''' (from Sweet 1964): Depressed (rarely compressed, at least in early stages) exogastric brevicones and cyrtocones; siphuncle broadly expanded, actinosiphonate in some Devonian species.

Revision as of 01:34, 9 August 2013

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