Classification of the genus Nielsenicrinus
G. †Nielsenicrinus Rasmussen 1961
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†Nielsenicrinus agassizii Hagenow 1840
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Invalid names: Pentacrinites klodenii Hagenow 1840 [synonym]
†Nielsenicrinus carinatus Roemer 1840
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Invalid names: Isocrinus courvillensis Valette 1917 [synonym], Isocrinus icaunensis Valette 1917 [synonym]
†Nielsenicrinus chavannesi Loriol 1879
†Nielsenicrinus crassitabulatus Biese 1930
†Nielsenicrinus cretaceus Leymerie 1842
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Invalid names: Pentacrinus fittoni Austin 1845 [objective synonym]
†Nielsenicrinus ewaldi Jagt 1999
†Nielsenicrinus fionicus Nielsen 1913
†Nielsenicrinus japonicus Oji et al. 1996
†Nielsenicrinus obsoletus Nielsen 1913
†Nielsenicrinus rosenkrantzi Rasmussen 1961
†Nielsenicrinus waiteteensis Eagle 1993