#acleistoceratidae

Acleistoceratidae

Extinct family of molluscs

The Acleistoceratidae is a family of oncocerids that contains genera characterized by depressed exogastric brevicones and cyrtocones that range from the Middle Silurian to the Middle Devonian. The siphuncle is broadly expanded, and in some actinosiphonate.

Mon 22nd

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