Temporal range: Albian–Cenomanian
|Mariella lewesiensis fossil|
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.
||This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (October 2013)|
- 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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