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

DEL RÍO, CLAUDIA JULIA

THE NAUTILUS (PHILADELPHIA)

BAILEY-MATTHEWS SHELL MUSEUM

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

0028-1344

ABstractRetrotapes. 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 Antarctica 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 Tertiarv representatives of the Subfamily Tapetinae (Family Veneridae) from southern South .America and .Antarctica that had been previously placed in Venus Linne. 1758, Marcia H.and .A. Adams, 1857, Eurhomalea Cossmann,1920, Samarangia Dall, 1902, and Katelysia Romer, 1857. The Argentine Tertiary species Retrotapes ninfasiensis, new species, R. fuegoensis. new species, R. striatolaniellata (Ihering, 1897) and R. scutata (Ihering, 1907) are here described and illustrated. The Recent Argentine Venus exalbida Chemnitz, 1795 and Venus lenticularis Sowerby, 1835, the Antarctic V. antarctica 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. colchaguensis Phillippi, 1887 are also included in this new genus.