What is "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.