Clymenia (ammonite)

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For the plant genus Clymenia, see Clymenia (plant)
Clymenia
Temporal range: Famennian[1]
Clymeniidae - Clymenia laevigata.JPG
Fossil shell of Clymenia laevigata, on display at Galerie de paléontologie et d'anatomie comparée, Paris
Scientific classification e
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Clymeniida
Family: Clymeniidae
Genus: Clymenia (ammonite)
Swingle, 1939
Species [2]

Clymenia is a genus in the ammonoid order Clymeniida, restricted to the Upper Devonian, characterized as with all clymeniids by a dorsal siphuncle that runs along the inside of the whorls, unusual for ammonoids.

Clymenia has a closely coiled evolute shell that may be faintly ribbed. The dorsum, on the inside of the whorl, is slightly impressed, a result of the outermost whorl slightly enveloping the previous. The venter may be rounded or acute. The suture is simple, with a broad ventral saddle, broad lateral lobe, a dorso-lateral saddle, and a moderately deep hidden dorsal lobe. Septal necks are usually short and do not form a continuous tube. The suture and siphuncle are characteristic of the family.

Clymenia is included in the family Clymeniidae. Is fossils have been found in Europe and Western Australia.

References[edit]

Notes
  1. ^ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28. 
  2. ^ "Paleobiology Database - Clymenia". Retrieved 2014-05-28. 
Bibliography
  • Rocks, Minerals & Fossils of the World by Chris Pellant and Roger Phillips
  • Treatise on Invertebrate Paleontology, Part L Ammonoidea; Geological Society of America and Univ of Kansas Press, 1964