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| image = Stephanoceratidae - Garantiana garantiana.JPG |image_caption = Fossil of ''Garantiana garantiana'' from France, on display at Galerie de paléontologie et d'anatomie comparée in Paris |regnum = Animalia |phylum = Mollusca |classis = Cephalopoda |subclassis = Ammonoidea |ordo = Ammonitida |superfamilia = Stephanocerataceae |familia = Stephanoceratidae |genus = ''Garantiana'' }} ''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''. ==External Links== * (''Garantiana'' ) in Hildoceras webpage () * (''Garaniana'' ) pictured in the Fossil Forum () 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Garantiana」の詳細全文を読む スポンサード リンク
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