BASES PALEONTOLÓGICAS DE LA BIODIVERSIDAD DE MOLUSCOS DEL ATLÁNTICO SUDOCCIDENTAL PALEONTOLOGICAL DATA FOR THE MOLLUSCA BIODIVERSITY FROM SOUTHWEST ATLANTIC

MARTINEZ, SERGIO; DEL RIO, CLAUDIA JULIA; ROJAS, ALEJANDRA

Cénarios de Vida

bELEN

Año: 2011; p. 107 - 117

A review of the Tertiary molluscan assemblages of the Southern Atlantic Ocean indicates thatthe origins of the recent communities can be traced back to the Late Miocene, although duringthat time the species formed biogeographic units different from the recent ones due to an alsodifferent oceanic circulation pattern. Until now, no Pliocene marine faunas have been foundin the region. This hiatus occurrs in an important epoch as in the Quaternary, extant speciesare recorded. However, biogeographic changes indicate warmer waters than today to the south,especially during the Late Pleistocene (probably OIS 5e) and the Holocene (between 6500-3500 radiocarbonic yrs BP). This situation is more evident in the Río de la Plata area as this isthe distribution boundary of several warm water species.