Hatai, K.; Noda, H. (1975). An armored worm from the Miocene Yoko-o Formation, Nagano Prefecture, Japan. Transactions and Proceedings of the palaeontological Society of Japan. 100: 209-219, plates 19-22.
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Hatai, K.; Noda, H.
1975
An armored worm from the Miocene Yoko-o Formation, Nagano Prefecture, Japan.
Transactions and Proceedings of the palaeontological Society of Japan