''Clymeniidae'' is a family in the

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 cuttlefi ...

order

Clymeniida Clymeniida is an order of ammonoid cephalopods from the Upper Devonian characterized by having an unusual dorsal siphuncle. They measured about in diameter and are restricted to Europe, North Africa, and possibly Australia. Morphologic cha ...

. It is characterized by a dorsal

siphuncle The siphuncle is a strand of tissue passing longitudinally through the shell of a cephalopod mollusk. Only cephalopods with chambered shells have siphuncles, such as the extinct ammonites and belemnites, and the living nautiluses, cuttlefish, and ...

that runs along the inside of the whorls, unusual for ammonoids.

Genera

*''

Aktuboclymenia ''Aktuboclymenia'' is an extinct genus of ammonites that existed during the 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 ...

'' Bogoslovsky 1979 *'' Clymenia'' Münster, 1834

Distribution

Fossils of species within this family have been found in the

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, w ...

of Australia.

References

''Clymeniidae''
in the

Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database (PBDB) originated in the NCEAS-funded Phanerozoic Marine Paleo ...

GBIFEncyclopedia of Life
Clymeniina Ammonite families Devonian ammonites Late Devonian first appearances Late Devonian animals Famennian extinctions {{Clymeniida-stub