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 | ... TOCERATID ... (5 elements)es (2) : ORTOCERATIDA · PROTOCERATIDAE pt (3) : ACANTOCERATIDEA · ACANTOCERATIDEAS · ACANTOCERATIDEOS |
 | ... OCERATID ... (13 elements) ACANTOCERATIDEA · ACANTOCERATIDEAS · ACANTOCERATIDEOS · ANCYLOCERATIDA · DENDROCERATIDA · DENDROCERATIDE · DENDROCERATIDES · OCHYROCERATIDAE · ORTHOCERATIDAE · ORTOCERATIDA ACANTOCERATIDEA · ACANTOCERATIDEAS · ACANTOCERATIDEOS · ORTOCERATIDA · ORTOCERATITER · PROTOCERATIDAE |
 | ... NTOCERATID ... (3 elements) ACANTOCERATIDEA · ACANTOCERATIDEAS · ACANTOCERATIDEOS ... OTOCERATID ... (1 element) PROTOCERATIDAE ... RTOCERATID ... (1 element) ORTOCERATIDA ... TOCERATIDA ... (2 elements) ORTOCERATIDA · PROTOCERATIDAE ... TOCERATIDE ... (3 elements) ACANTOCERATIDEA · ACANTOCERATIDEAS · ACANTOCERATIDEOS |