Garantiana
Garantiana is a genus ammonite from the Bajocian stage at the beginning of the Middle Jurassic, included in the family Stephanoceratidae.
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| Fossil of Garantiana garantiana from France, on display at Galerie de paléontologie et d'anatomie comparée in Paris | |
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| Genus: | Garantiana |
Description
Garantiana is strongly ribbed and generally evolute. The inner whorls are exposed in a wide and fairly deep umbilicus. Ribs arise at the umbilical margin and split in two (bifurcate) about midway up the sides and cross over the outer (ventral) rim.
Garantiana was named by d'Orbigny, 1845. The type species is Garantiana garantiana, which comes from France. Related genera include Orthogarantiana Pseudogarantiana, and Strenoceras.
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External links
- Garantiana in Hildoceras webpage
- Garaniana pictured in the Fossil Forum
References
- Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology. 364: 560. Archived from the original on 2008-05-07. Retrieved 2008-04-05.
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