Are the Upper Jurassic ammonite genera Progeronia Arkell, 1953 and Hugueninsphinctes Atrops, 1982 a dimorphic pair? A fresh look upon their type species
Keywords:
ammonites, Kimmeridgian, systematics, revisionAbstract
The type species of the Upper Jurassic ammonite genera Progeronia Arkell, 1953 and of its supposed dimorphic partner Hugueninsphinctes Atrops, 1982 are analyzed. Perisphinctes progeron v. Ammon, 1875, type species of Progeronia, is based on an incomplete phragmocone that originated from beds of the Platynota or Hypselocyclum zones, or even from older beds of the Galar Subzone. Its phyletic relationship with ammonites of the Acanthicum Zone commonly assigned to Progeronia is still unresolved and a matter of further discussion. At present, we consider the genus Progeronia a nomen dubium and restrict it to its type species. Ammonites polyplocus breviceps Quenstedt, 1887, the type species of Hugueninsphinctes, is confirmed to originate from much younger beds of the Acanthicum Zone. We suggest including also the corresponding macroconchiates of the Divisum and Acanthicum zones into this better-defined genus.Downloads
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