species occurrence Argentina 38 South America 24 new record 12 taxonomy 12 Cretaceous 10 Patagonia 10 Atlantic Ocean 8 Buenos Aires [Argentina] 8 Atlantic Ocean (Southwest) 6 Neuquen Basin 6 abundance 6 biostratigraphy 6 fossil record 6 morphology 6 paleontology 6 phylogenetics 6 Africa 4 Ammonoidea 4 Aves 4 Biogeography 4 Crustacea 4 Ecosystems 4 Neuquén Basin 4 Phylogeny 4 Taxonomy 4 Tetraphyllidea 4 Western Hemisphere 4 World 4 anatomy 4