Acanthoclymenia neapolitana

Acanthoclymenia is genus of ammonoid cephalopods belonging to the Acanthoclymeniidae family. Species belonging to this genus lived in middle and late Devonian. Its fossils were found in Europe, Asia, north Africa, North America and Australia. Species of this genus had discoidal shells with flattened venter.

Species and distribution
There were more finds of this genus, but without valid description:
 * Acanthoclymenia neapolitana  Clarke, 1898 : ca 383.7 - 376.1 mya of USA (New York) and Australia.
 * Acanthoclymenia forcipifer  Sandberger & Sandberger, 1851 : ca 378.7 - 376.9 mya of Algeria, Germany, Great Britain Kazakhstan and China (Guangxi and Guizhou).
 * Acanthoclymenia genundewa  Clarke, 1899 : ca 383.3 - 382.7 mya of USA (New York) and Poland.
 * Acanthoclymenia planorbis  Sandberger & Sandberger, 1851 : ca 377.5 - 376.9 mya of USA (New York).
 * Acanthoclymenia aff. genundewa  Clarke, 1898 : ca 378.7 - 376.9 mya of USA (West Virginia) and Russia (Southern Timan).
 * Acanthoclymenia aff. neapolitana  Clarke, 1898 : ca 383.7 - 376.1 mya of Australia.
 * Acanthoclymenia n.sp. juv.  Becker et al. 2000 : ca 378.7 - 377.5 mya of Russia (Southern Timan).