Kingdom Animalia Phylum Mollusca Order Clymeniida | Family †Clymeniidae Rank Genus Subclass Ammonites | |
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Similar Ammonites, Clymenia laevigata, Clymeniida, Platyclymenia, Cymaclymenia | ||
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.