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Garantiana

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Kingdom  Animalia
Subclass  Ammonoidea
Superfamily  Stephanocerataceae
Scientific name  Garantiana
Rank  Genus
Phylum  Mollusca
Order  Ammonitida
Family  Stephanoceratidae
Higher classification  Stephanoceratidae
Garantiana httpsuploadwikimediaorgwikipediacommonsthu
Similar  Dorsetensia, Grammoceras, Euaspidoceras, Euhoplites, Gleviceras

Garantiana is a strongly ribbed, generally evolute ammonite from the Bajocian stage at the beginning of the Middle Jurassic, included in the family Stephanoceratidae. 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.

References

Garantiana Wikipedia


Similar Topics
Dorsetensia
Euaspidoceras
Gleviceras
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