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... PROTOCERATIDAE ... (1 element)es (1) : PROTOCERATIDAE | |
... OCERATIDAE ... (4 elements) OCHYROCERATIDAE · ORTHOCERATIDAE · PROTOCERATIDAE ... OTOCERATID ... (1 element) PROTOCERATIDAE ... PROTOCERAT ... (18 elements) PROTOCERATIDAE · PROTOCERATOPIDAE · PROTOCERATOPO · PROTOCERATOPS · PROTOCERATOPSID · PROTOCERATOPSIDAE ... ROTOCERATI ... (1 element) PROTOCERATIDAE ... TOCERATIDA ... (2 elements) ORTOCERATIDA · PROTOCERATIDAE | |