Cainozoic Research, 4(1-2), pp. 41-49, February 2006 Latest Miocene Myliobatids (Batoidei, Selachii) from the Alvalade Basin, Portugal ² Miguel Telles+Antunes¹ & Ausenda Cáceres+Balbino 1 Centro de Estudos Geologicos, Faculdade de Ciencias e Tecnologia (UNL)/ Quinta da Torre 2829-516 Caparica, Portugal. e-mail:
[email protected] 2 Departamentode Geociencias, Universidade de Evora, Apartado 94, 7002-554 Evora, Portugal, e-mail:
[email protected]. Received 5 April 2003; revised version accepted 12 January 2005 Myliobatid teeth from the EsbarrondadoiroFormation(Alvalade Basin, Portugal) are described. These teeth have been attributed to the Aetobatus A. cf. and Other teeth genera (represented by cappettai n. sp.), Myliobatis (M. aquila) Pteromylaeus (P. sp.). Myliobatid are from extinct whose taxonomic remains unresolved. an genus status colhidos da de de São descritos dentes de Myliobatidae em depósitos Formacão Esbarrondadoiro (Bacia Alvalade), dos géneros Aetoba- cf. Outros tus (representado por Aetobatus cappettai, nov. sp.), Myliobatis (M. aquila) e Pteromylaeus (P. sp.). dentes, pertencentes a ainda esclarecida.. géneros extintos, são de posição taxonómica não Key words: Myliobatidae, Alvalade Basin, Miocene, new species. Introduction sence ofthe extant great white shark, Carcharodon carcha- Pliocene rias Linne, 1758, that was more common in than The Alvalade basin its differentiationin (Portugal) began the at the time declining Carcharocles megalodon Agassiz, Miocene times. A horst the lower Alentejo region in Late 1843. Teeth of C. carcharias too to are large pass unno- of Paleozoic rocks (the Valverde horst) composed sepa- ticed after washing and sieving of tons of sedimentsfrom rated this from the much lower depression larger Tagus the EsbarrondadoiroFormation.