Classification of the genus Yokoyamaella
G. †Yokoyamaella Minato and Kato 1965
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Subg. †Yokoyamaella (Maoriphyllum) Minato and Kato 1965
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†Yokoyamaella (Maoriphyllum) christofi Blendinger and Flügel 1990
†Yokoyamaella (Maoriphyllum) maoria Leed 1956
†Yokoyamaella (Maoriphyllum) matsushitae Yamagiwa 1962
†Yokoyamaella (Maoriphyllum) minense Minato and Kato 1965
†Yokoyamaella (Maoriphyllum) nishinense Yamagiwa 1962
†Yokoyamaella (Maoriphyllum) ozawai Minato 1955
Subg. †Yokoyamaella (Yokoyamaella) Minato and Kato 1965
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†Yokoyamaella (Yokoyamaella) carinthiaca Heritsch 1936
†Yokoyamaella (Yokoyamaella) kaludjeracensis Minato and Kato 1965
†Yokoyamaella (Yokoyamaella) kurohime Minato and Kato 1965
†Yokoyamaella (Yokoyamaella) stillei Heritsch 1936
†Yokoyamaella (Yokoyamaella) tertioseptata Yokoyama 1960
†Yokoyamaella (Yokoyamaella) yokoyamai Ozawa 1925
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Invalid names: Stylidophyllum matsunagiense Yamagiwa 1962 [synonym], Wentzelella shimoyukawensis Yamagiwa 1962 [synonym]
†Yokoyamaella oregonensis Nestell and Stevens 2013