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Article: Ontogenetic and evolutionary patters of shape differentiation during the initial diversification of Paleocene acarininids (planktonic foraminifera)

Article from:
Paleobiology
Article date:
October 1, 2002
Author:
Copyright

Abstract.-Previous studies have established a close relationship between the evolutionary origin of new Glades of planktonic foraminifera and heterochrony. Studies of the Paleogene radiation of the genus Morozovella revealed, for example, a temporal pattern of variation consistent with paedomorphosis. Our study focused on the late Paleocene species of Acarinina, sister group of Morozovella. Shape variations related to evolution and ontogeny are appraised through a morphometric method based on outline analysis using the elliptic Fourier transform. Patterns of developmental and evolutionary changes are studied and compared within each species (Acarinina nitida, A. subsphaerica, and A. ...

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