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- Psiloceratoidea es una superfamilia de cefalópodos ammonoides del Jurásico Temprano propuesto por Hyatt en 1867, asignados al orden Ammonitida. Tuvieron mucho éxito durante el Hettangiense y el Sinemuriense. El último de ellos, la familia Cymbitidae y los géneros Hypoxynoticeras y Radstockiceras sobrevivieron hasta el Pliensbachiense temprano. Psiloceratoidea probablemente se deriva de la familia , que eran miembros de del Triásico. Al igual que sus antepasados, los Psiloceratidae se mantuvieron lisos y redondeados durante toda su vida. Los Schlotheimiidae eran diferentes, ya que tenían chevrones ventrales. El resto de las familias tenían ventosa angular o quilla durante al menos parte de su ontogenia. La mayoría de los miembros de esta superfamilia solo tenían costillas simples, pero unos pocos de ellos han desarrollado también costillas secundarias. Si bien algunos miembros son involutas y algunos Oxynoticeratidae eran oxiconas, la mayoría de las especies fueron evolutas. (es)
- Psiloceratoidea is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida. They were very successful during Hettangian and Sinemurian. Last of them, family Cymbitidae and genera Hypoxynoticeras and Radstockiceras survived into Early Pliensbachian. Psiloceratoidea is probably derived from the family Ussuritidae, which were Triassic members of . Similar to their ancestors, Psiloceratidae kept smooth, rounded venter for whole of their life. Schlotheimiidae were different, as they had ventral chevrons. Rest of the families had angular venter, or keel for at least part of their ontogeny. Most of the members of this superfamily had only simple ribs, but few of them have evolved also secondary ribbing. While some members are involute and some Oxynoticeratidae were oxycone, most of the species were evolute. (en)
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- 4737 (xsd:nonNegativeInteger)
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- Family Arietitidae, Asteroceras stellare (en)
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- Psiloceratoidea es una superfamilia de cefalópodos ammonoides del Jurásico Temprano propuesto por Hyatt en 1867, asignados al orden Ammonitida. Tuvieron mucho éxito durante el Hettangiense y el Sinemuriense. El último de ellos, la familia Cymbitidae y los géneros Hypoxynoticeras y Radstockiceras sobrevivieron hasta el Pliensbachiense temprano. (es)
- Psiloceratoidea is a superfamily of Early Jurassic ammonoid cephalopods proposed by Hyatt in 1867, assigned to the order Ammonitida. They were very successful during Hettangian and Sinemurian. Last of them, family Cymbitidae and genera Hypoxynoticeras and Radstockiceras survived into Early Pliensbachian. (en)
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- Psiloceratoidea (en)
- Psiloceratoidea (es)
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