Peltoceras marysae (macroconch)
Associated dimorph: Peltoceras marysae
Ammonoidea
[Beta] View Peltoceras sp. occurences on the world map.
Diameter: 123 mm.
Peltoceras marysae is an evolute species and its ornamentation changes a lot along its growth. The inner whorls show fine, dense simple ribs, which then become a bit stronger and sometimes fork. Then appears a bituberculated stage with very strong tubercles. The ornamentation becomes softer on the body chamber.
2005 . Bonnot A., Boursicot P.-Y. & Ferchaud P.
Peltoceras marysae, une nouvelle espèce de Peltoceratinae (Ammonitina, Aspidoceratidae) dans l'horizon à Leckenbyi (Callovien supérieur, zone à Athleta) de Montreuil-Bellay (Maine-et-Loire, France). - Revue de Paléobiologie, Muséum d'Histoire Naturelle, Genève, vol. 24, n° 1
p. 75 to 95
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Guillaume
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