Masiakasaurus dinosaurs. Artwork of two small predatory theropod dinosaurs of the genus Masiakasaurus, hunting by a river in a forest of cypress, ferns and horsetails 70 million years ago in what is today the island of Madagascar. Masiakasaurus was a small-bodied carnivore that grew to about 1.8 metres in length and weighed up to 90 kilograms. Its front teeth were projected forward, giving it a buck toothed appearance, an adaptation that is believed to have aided it in catching fish and other small prey.