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" ... One of the most fascinating things about this new species of walrus is that it is not the only one from that same general geographic region in Japan. There is another species, Pseudotaria muramotoi, that has been discovered and described from the same formation. P. muramotoi looks very different from A. akamatsui, but they likely co-existed. This suggest a rapid diversification of walruses during this geological period, perhaps mediated by the rising and falling sea levels. As walruses would be able to spread out and obtain food from new habitats when sea level was low, as it rose again, they could become geographically isolated and morphologically distinct from nearby populations. ... "