''Acanthoclymenia'' is genus of

ammonoid Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

cephalopods belonging to the Acanthoclymeniidae

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

. Species belonging to this genus lived in middle and late

Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, whe ...

(upper

Givetian The Givetian is one of two faunal stages in the Middle Devonian Period. It lasted from million years ago to million years ago. It was preceded by the Eifelian Stage and followed by the Frasnian Stage. It is named after the town of Givet in Fra ...

- lower

Frasnian The Frasnian is one of two faunal stages in the Late Devonian Period. It lasted from million years ago to million years ago. It was preceded by the Givetian Stage and followed by the Famennian Stage. Major reef-building was under way during th ...

). 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

* ''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). There were more finds of this genus, but without valid description: * ''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).

References

Acanthoclymeniidae Middle Devonian ammonites Late Devonian ammonites Paleozoic ammonites of Europe Ammonites of Africa Ammonites of Asia Devonian ammonites of North America Ammonites of Australia {{Clymeniida-stub