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American Miogypsinidae: An analysis of their phylogeny and biostratigraphy

Marcelle K. BouDagher-Fadel and G. David Price
Micropaleontology
Vol. 56, No. 6 (2010), pp. 567-586
Stable URL: http://www.jstor.org/stable/40983741
Page Count: 20
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
American Miogypsinidae: An analysis of their phylogeny and biostratigraphy
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Abstract

Over 1000 samples from cores and cutting from 37 wells from offshore South America have been investigated and have provided new insight into the evolution of the miogypsinids. For the first time Paleomiogypsina, a genus first described from the Late Oligocene of Japan, is reported from the Early Oligocene of the American province. One new genus, Americogypsina and 18 new species, Neorotalia sp. 1, Paleomiogypsina braziliana, P. americana, Americogypsina braziliana, A. americana, A. koutsoukosi, Miogypsinella elongata, Mlla matsumaria, Mlla sp. 1, Miogypsinoides praegunteri, Mdes sp. 1, Miogypsinodella braziliana, Miogypsina triangulata, M. americoprimitiva, Miolepidocyclina braziliana, Ml. sp. 1, Ml. sp. 2, Ml sp. 3 are described. The American, regional evolutionary lineages of the miogypsinids taxa are described, starting in the Early Oligocene and ending in the Early Miocene. Their phylogenetic lineages are similar to those of the Tethyan miogypsinids, however the stratigraphic ranges of the main genera and their species are different, as the American miogypsinids made their first appearance earlier than their morphologically similar Tethyan counterparts.

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