最終更新日：2022/12/24
The position of the Walrus is between Sirenidia and Pachydermata ; they belong to the pachydermic order by structural evidences, and bear only analogies to the seals.
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The position of the Walrus is between Sirenidia and Pachydermata ; they belong to the pachydermic order by structural evidences, and bear only analogies to the seals.
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