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Grypoceras mesodicum
Taxonomy
Nautilus mesodicus was named by Hauer (1846).
It was recombined as Grypoceras mesodicum by von Mojsisovics (1902), Schastlivtseva (1988).
It was recombined as Grypoceras mesodicum by von Mojsisovics (1902), Schastlivtseva (1988).
Sister species lacking formal opinion data