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Treptoceras yokoyamai
Taxonomy
Loxoceras yokoyamai was named by Kobayashi (1927). It is not extant. Its type specimen is UMUT PM0016, a shell.
It was recombined as Sactoceras yokoyamai by Kobayashi (1934); it was recombined as Ormoceras yokoyamai by Yun (1999); it was recombined as Treptoceras yokoyamai by Niko (2002).
It was recombined as Sactoceras yokoyamai by Kobayashi (1934); it was recombined as Ormoceras yokoyamai by Yun (1999); it was recombined as Treptoceras yokoyamai by Niko (2002).