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Animalia
Mollusca
Cephalopoda
Ammonoidea
Acanthocerataceae
Collignoniceratidae
Prionocyclus
Prionocyclus germari
Prionocyclus hyatti
[
Prionotropis hyatti
]
Prionocyclus macombi
Prionocyclus novimexicanus
Prionocyclus quadratus
Prionocyclus wyomingensis