Mariella
For other uses, see Mariella (disambiguation).
| Mariella Temporal range: Albian–Cenomanian | |
|---|---|
 | |
| Mariella lewesiensis fossil | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Ammonoidea |
| Order: | Ancyloceratida |
| Superfamily: | Turrilitaceae |
| Family: | Turrilitidae |
| Genus: | Mariella Nowak, 1916 |
Mariella is an ammonoid genus, named by Nowak (1916) from the upper Albian and Cenomanian stages of the mid Cretaceous, included in the Turrilitidae. Its type is Turrilites bergeri
Description
Mariella resembles Turrilites in general form. The shell is asymmetric, closely wound in a long expanding trochoidal spire. Ribs are slightly oblique and are rather feeble, each with 4 more or less equally spaced tublercles. Turrilites differs primarily in being more strongly ribbed and in having a more oval aperture.
References
- Paleobiology Database
- Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.
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