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About: Acleistoceratidae     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : umbel-rc:Mollusk, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: insectumbel-rc:Mollusk New Facet based on Instances of this Class

The Acleistoceratidae is a family of oncocerids that contains genera characterized by depressed (or rarely compressed) exogastric brevicones and cyrtocones (Sweet, 1964 K398) that range from the Middle Silurian to the Middle Devonian. The siphuncle is broadly expanded, and in some actinosiphonate. The Acleistoceratidae are derived from Oncoceras (Oncoceratidae) through , independently of the Oonoceras stock. The family is named for the genus Acleistoceras. All told some 22 genera have been described.