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Table 2 Number of echinoid genera and higher taxa relative to the number of collections found in each time interval

From: A new fossil species of Clypeaster (Echinoidea) from Malaysian Borneo and an overview of the Central Indo-Pacific echinoid fossil record

Time interval Number of occurrences Number of genera and higher taxa
Neogene undifferentiated 18 13
Eocene 5 3
Oligocene 10 7
Miocene 278 83
Pliocene 114 35
Pleistocene 15 13