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known only from the Arenigian whereas Ancistroceras ranges through most of the Middle Ordovician. Ancistroceras may have given rise to Rhynchorthoceras
Ancistroceras
Genus of nautiloids
section of Ancistroceras, but with only a curved, cyrtoconic apex instead of juvenile whorls. Rhynchorthoceras is probably derived from Ancistroceras by a loss
Rhynchorthoceras
Order of molluscs
Glenister) have their beginnings in the Early Ordovician with forms like Ancistroceras. Their diversity increased after the late Arenigian extinction (Floian-Dapingian)
Lituitida
Family of molluscs
Ancistroceras indicating a more passive lifestyle, or a complex aperture with lappets as in Litoceras. The earliest known lituitids are Ancistroceras
Lituitidae
Genus of cephalopods
being Ancistroceras. Holmiceras begins with about 1.5 to 2 loosely coiled whorls followed by a rapidly expanding orthocone, much like Ancistroceras except
Holmiceras
includes new species A. mazaevi. Ancistroceras ristnensis Sp. nov Valid Aubrechtová & Meidla Ordovician Estonia Ancistroceras vahikuelaensis Sp. nov Valid
2020_in_paleomalacology
†Amphicyrtoceras †Amsleroceras †Anamesoceras †Anaspyroceras †Anastomoceras †Ancistroceras †Andreioceras †Anepheloceras †Angaroceras †Angelinoceras †Anglicornus
List of prehistoric nautiloid genera
List_of_prehistoric_nautiloid_genera
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