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 | ... OCERATIDA ... (7 elements)de (1) : OCHYROCERATIDAE en (4) : ANCYLOCERATIDA · DENDROCERATIDA · OCHYROCERATIDAE · ORTHOCERATIDAE es (2) : ORTOCERATIDA · PROTOCERATIDAE |
 | ANCYLOCERATIDA · DENDROCERATIDA · OCHYROCERATIDAE · ORTHOCERATIDAE · ORTOCERATIDA · PROTOCERATIDAE ... OCERATID ... (13 elements) ACANTOCERATIDEA · ACANTOCERATIDEAS · ACANTOCERATIDEOS · ANCYLOCERATIDA · DENDROCERATIDA · DENDROCERATIDE · DENDROCERATIDES · OCHYROCERATIDAE · ORTHOCERATIDAE · ORTOCERATIDA |
 | ... HOCERATIDA ... (1 element) ORTHOCERATIDAE ... LOCERATIDA ... (1 element) ANCYLOCERATIDA ... OCERATIDAE ... (4 elements) OCHYROCERATIDAE · ORTHOCERATIDAE · PROTOCERATIDAE ... ROCERATIDA ... (3 elements) DENDROCERATIDA · OCHYROCERATIDAE ... TOCERATIDA ... (2 elements) ORTOCERATIDA · PROTOCERATIDAE |