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†Rhyoptychoceras Matsumoto 1977
urn:lsid:organismnames.com:name:2043699
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†Rhyoptychoceras Matsumoto 1977
Matsumoto 1977. Some heteromorph ammonites from the Cretaceous of Hokkaido (studies of the Cretaceous ammonites from Hokkaido and Saghalien-31). Memoirs Fac Sci Kyushu Univ (Geol), 23(3) 1977: 303-366,illust.