W. G. Cordey, W. A. Berggren, R. K. Olsson; Phylogenetic trends in the planktonic foraminiferal genus Pseudohastigerina Banner and Blow, 1959. Micropaleontology ; 16 (2): 235–242. doi:
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Derivation of P. micra from P. wilcoxensis during middle Eocene by gradual compression of test, reduction in test size in late Eocene-early Oligocene (P. micra P. cf. naguewichiensis)
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