About: Acleistoceratidae

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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.

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  • 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. (en)
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  • Flower in Flower & Kümmel 1950 (en)
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  • MSilurian- MDevonian (en)
dbp:taxon
  • Acleistoceratidae (en)
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  • 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. (en)
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  • Acleistoceratidae (en)
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