<i>MIOCENE AND MODERN MALACOLOGICAL PROVINCES FROM SOUTHWESTERN ATLANTIC</i>

Authors

  • Sérgio Martínez
  • Claudia del Rio
Keywords: biogeography, paleobiogeography, late Miocene, Southwestern Atlantic, Argetina, Uruguay

Abstract

Southwestern Atlantic Recent and Miocene Malacological Provinces are recognized as properly delimited, according to Jaccard and Simpson association coefficients. The Recent Argentinean Province is considered a Provincetone between the Magellanic and the Brazilian Provinces, and one of its principal characteristics is the presence of magellanic elements most probably coming from the Southeastern Pacific. Its development happened after the Antarctic Circumpolar Current fully began to operate, originating the cold Malvinas (Falkland) Current. The Argentinean Province is not the geographic/temporal continuity of the molluscan assemblages that lived during Late Miocene times in the region. Instead, these latter associations constituted the Miocene Valdesian and Paranaian Provinces, mostly integrated by Caribbean elements. When these biogeographic units desintegrated because of the cooling of surface waters caused by the implantation of the Malvinas Current, the tropical elements did not stay in the high latitudes of the Western Atlantic Ocean, but moved back northwards where are restricted today or became extinct.

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Author Biographies

Sérgio Martínez

INGEPA Facultad de Ciencias

Claudia del Rio

Museo Argentino de Ciencias Naturales
How to Cite
Martínez, S., & Rio, C. del. (2002). <i>MIOCENE AND MODERN MALACOLOGICAL PROVINCES FROM SOUTHWESTERN ATLANTIC</i>. Anales de Biología, (24), 121–130. Retrieved from https://revistas.um.es/analesbio/article/view/31491
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