Answer Happy

This phylogenetic hypothesis shows the relationships among major clades of vertebrates. De- rived characters are listed for some clades; for example, only gnathostomes have a jaw. In some lineages, derived traits have been lost over time or occur in reduced form; for example, hagfish- es and lampreys are vertebrates with highly reduced vertebrae. Myxini (hagfishes) Common ancestor of vertebrates | Petromyzontida (lampreys) Vertebral column Chondrichthyes (sharks, rays, chimaeras) Vertebrates Cyclostomes Gnathostomes Osteichthyans Lobe-fins Actinopterygii (ray-finned fishes) Jaws, mineralized skeleton Lungs or lung derivatives Actinistia (coelacanths) Lobed fins Dipnoi (lungfishes) Tetrapoda (amphibians, reptiles, mammals) Tetrapods Limbs with digits Based on the phylogeny in the figure, which vertebrate group would have jaws and a mineralized skeleton, lungs or lung derivatives, and lobed fins but no limbs with digits? Tetrapoda O Dipnoi O Actinopterygii Chondrichthyes