Cenozoic Biogeographic History of the Eurothermal Genus Retrotapes n. gen.(Subfamily Tapetinae) from Southern South America and Antarctica.

DEL RÍO, CLAUDIA JULIA

The Nautilus

Lugar: Estados Unidos; Año: 1997 vol. 110 p. 77 - 93

ABSTRACT Retrotapes, new genus, comprises a group of Neoaustral bivalves that appeared in the southern circumpolar regions by the Eocene and have since been confined to the high latitudes of the southern hemisphere. Its presence in the Tertiary strata of Antárctica and southern South America reflects an active faunal interchange between both regions during the Eocene.new genus, comprises a group of Neoaustral bivalves that appeared in the southern circumpolar regions by the Eocene and have since been confined to the high latitudes of the southern hemisphere. Its presence in the Tertiary strata of Antárctica and southern South America reflects an active faunal interchange between both regions during the Eocene. Retrotapes is here proposed to include to those Recent and Tertiary representatives of the Subfamily Tapetinae (Family Veneridae) from southern South America and Antárctica that had been previously placed in Venus Linné, 1758, Marcia H. and A. Adams, 1857, Eurhomalea Cossmann,1920, Samarangiais here proposed to include to those Recent and Tertiary representatives of the Subfamily Tapetinae (Family Veneridae) from southern South America and Antárctica that had been previously placed in Venus Linné, 1758, Marcia H. and A. Adams, 1857, Eurhomalea Cossmann,1920, SamarangiaVenus Linné, 1758, Marcia H. and A. Adams, 1857, Eurhomalea Cossmann,1920, SamarangiaEurhomalea Cossmann,1920, Samarangia Dall,1902, and Kalelysia Rómer, 1857. The Argentine Tertiary species Retrotapes ninfasiensis, new species, R. fuegoensis,Kalelysia Rómer, 1857. The Argentine Tertiary species Retrotapes ninfasiensis, new species, R. fuegoensis,Retrotapes ninfasiensis, new species, R. fuegoensis, new species, R. striatolamellata (Ihering, 1897) and R. scutatastriatolamellata (Ihering, 1897) and R. scutata (Ihering, 1907) are here described and illustrated. The Recent Argentine Venus exalbida Chemnitz, 1795 and Venus lenticularisVenus exalbida Chemnitz, 1795 and Venus lenticularis Sowerby, 1835, the Antarctic V. antárctica Sharman and Newton, 1894 and V. newtoni Wilckens, 1911 (Eocene-early Oligocene?, La Meseta Formation), and the Neogene Chilean species V. navidadis Philippi, 1887 and V. colchaguensís Philippi, 1887 are also included in this new genus.antárctica Sharman and Newton, 1894 and V. newtoni Wilckens, 1911 (Eocene-early Oligocene?, La Meseta Formation), and the Neogene Chilean species V. navidadis Philippi, 1887 and V. colchaguensís Philippi, 1887 are also included in this new genus.newtoni Wilckens, 1911 (Eocene-early Oligocene?, La Meseta Formation), and the Neogene Chilean species V. navidadis Philippi, 1887 and V. colchaguensís Philippi, 1887 are also included in this new genus.V. navidadis Philippi, 1887 and V. colchaguensís Philippi, 1887 are also included in this new genus.