This chapter provides an overview of the alpha paleobiodiversity of Angola based on the available fossil record that is limited to the sedimentary rocks, ranging in age from Precambrian to the present. The geological period with the highest paleobiodiversity in the Angolan fossil record is the Cretaceous, with more than 80% of the total known fossil taxa, especially marine molluscs, including ammonites as a majority among them. The vertebrates represent about 15% of the known fauna and about one tenth of them are species firstly described based on specimens from Angola. Keywords; Ammonites,  Benguela Basin,  Cenozoic,  Cretaceous,  Cuanza Basin,  Dinosaur,  Invertebrates, Mammals,  Mollusca,  Mosasaur ,  Namibe  basin,  Paleobiodiversity,  Pleistocene,  Vertebrate, Plesiosaur,  Turtle .