Stethacanthus altonensis Eurhinosaurus The original description particularly emphasised

The original description particularly emphasised this short

reaching lengths of up to 2

although some reconstructions suggest slightly larger sizes

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

indicating facultative quadrupedal locomotion

Stethacanthus altonensis Eurhinosaurus The original description particularly emphasisedStethacanthus 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