Stethacanthus altonensis Eurhinosaurus especially in the Western Interior

especially in the Western Interior Sea

and has since been the subject of studies due to its distinctive features among ichthyosaurs

estos felinos eran depredadores carnívoros que compartieron el paisaje con otras especies icónicas de la era glacial

como los neandertales y los primeros humanos modernos

although some reconstructions suggest slightly larger sizes

Stethacanthus altonensis Eurhinosaurus especially in the Western InteriorStethacanthus altonensis is an extinct cartilaginous fish from the Early Carboniferous (late Mississippian, approx. 330320 million years ago), belonging to the Symmoriida group within Chondrichthyes, a primitive lineage closely related to early sharks and chimaeras. It is the type species of the genus Stethacanthus, a taxon particularly renowned for one of the strangest anatomical structures known among Paleozoic vertebrates: a modified anterior