Classification of the genus Megayoldia
G. Megayoldia Verrill and Bush 1897
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Subg. †Megayoldia (Hataiyoldia)
Subg. Megayoldia (Megayoldia) Verrill and Bush 1897
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†Megayoldia (Megayoldia) thraciaeformis Storer 1838
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Invalid names: Microyoldia ochotensis Scarlato 1981 [synonym], Nucula groenlandica Posselt 1898 [synonym], Nucula navicularis Couthouy 1831 [synonym], Portlandia dalli Krause 1885 [synonym], Yoldia angularis Möller 1842 [synonym], Yoldia regularis Verrill 1884 [synonym], Yoldia scapha Yokoyama 1926 [synonym], Yoldia secunda Dall 1916 [synonym], Yoldia suavis Konova 1984 [synonym]
Subg. †Megayoldia (Portlandella) Stewart 1930
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†Megayoldia (Portlandella) pilvoensis Slodkewitsch 1938
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Invalid names: Yoldia obtusata Kristofovich 1984 [synonym]
†Megayoldia (Portlandella) watasei Kanehara 1937
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Invalid names: Yoldia deformis Kogan 1939 [synonym]
†Portlandia (Portlandella) euthynta Woodring 1973
Yoldia (Megayoldia) martyria Dall 1897
Yoldia (Megayoldia) montereyensis Dall 1893
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Invalid names: Megayoldia kamchatkana Scarlato 1981 [synonym], Yoldia beringiana Dall 1916 [synonym]