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. Litopterna from fossiliferous exposures of the Santa Cruz Formation (Early–Middle Miocene) along the Rio Santa Cruz, Patagonia Argentina, are analyzed and described. In the prospected localities, known as Barrancas Blancas (Estancia Aguada Grande and Estancia Santa Lucia) and Segundas Barrancas Blancas (Estancia Cordon Alto and Estancia El Tordillo), specimens belonging to the families Proterotheriidae and Macraucheniidae were recorded. Within Proterotheriidae, the species Anisolophus australis , A. floweri , Tetramerorhinus lucarius , Te. cingulatum , Thoatherium minusculum and Diadiaphorus majusculus have been identified. Macraucheniidae are scarcer and represented by Theosodon sp. Although the systematics of litopterns of the Santa Cruz Formation requires a review, the new remains from the Rio Santa Cruz reported here, as well as others recently recovered from the same unit in the Atlantic coast, will be valuable to clarify the taxonomy of this peculiar group of South American extinct ungulates. Key words.  Systematics. Proterotheriidae. Macraucheniidae. Santacrucian. Patagonia. Resumen. LITOPTERNA (MAMMALIA) PROCEDENTES DE LA FORMACION SANTA CRUZ (MIOCENO TEMPRANO–MEDIO) EN EL RIO SANTA CRUZ, SUR DE ARGENTINA. Se analizan y describen los Litopterna provenientes de los afloramientos de la Formacion Santa Cruz (Mioceno Temprano–Medio) a lo largo del Rio Santa Cruz, Patagonia Argentina. En las localidades prospectadas, conocidas como Barrancas Blancas (Estancias Aguada Grande y Santa Lucia) y Segundas Barrancas Blancas (Estancias Cordon Alto y El Tordillo), se hallaron especimenes asignables a las familias Proterotheriidae y Macraucheniidae. En el caso de los Proterotheriidae se han identificado Anisolophus australis , A. floweri , Tetramerorhinus lucarius , Te. cingulatum , Thoatherium minusculum y Diadiaphorus majusculus. Los Macraucheniidae son mas escasos y se encuentran representados por Theosodon sp. Si bien la sistematica de los litopternos de la Formacion Santa Cruz requiere una revision, los nuevos restos reportados aqui del Rio Santa Cruz, asi como otros recientemente recuperados de la misma unidad en la costa atlantica, seran valiosos para aclarar la taxonomia de este particular grupo de ungulados extintos de America del Sur. Palabras clave. Sistematica. Proterotheriidae. Macraucheniidae. Santacrucense. Patagonia.

LITOPTERNA (MAMMALIA) FROM THE SANTA CRUZ FORMATION (EARLY-MIDDLE MIOCENE) AT THE RÍO SANTA CRUZ, SOUTHERN ARGENTINA