Richard Cifelli; Observations on Globigerina pachyderma (Ehrenberg) and Globigerina incompta Cifelli from the North Atlantic. Journal of Foraminiferal Research ; 3 (4): 157–166. doi: https://doi.org/10.2113/gsjfr.3.4.157
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Both forms have self-contained histories and are separate species, distribution, the two populations (left-coiling and right-coiling) appear to be mutually exclusive
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