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Resumen:
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The ammonites assigned to the genera Fagesia Pervinquière, and Neoptychites Kossmat, of the Wiedmann (Tübingen, Germany) and Goy, Carretero and Meléndez (Madrid, Spain) collections obtained from the Iberian Trough have been revised. New mainly lower Turonian specimens of the species Fagesia catinus (Mantell), F. tevesthensis (Peron), F. rudra (Stoliczka), F. superstes (Kossmat), F. pachydiscoides Spath, and Neoptychites cephalotus (Courtiller) have also been presented. In addition we have described one new species: F. mortzestus. Studies of the morphologies and the geographical and stratigraphical distributions of all these species have led to the identification of several phylogenetic relationships between them, and to distinguishing one main phase in the evolution of the family Vascoceratidae Douvillé, characterised by the dominance of Fagesia with Neoptychites.
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