Are Guppies Jawless Fish? Lampreys and hagfishes are unusual, jawless fish that comprise the order Cyclostomata, so named because of the circular shape of the mouth. Which of the following is jawless? Lampreys and hagfishes are the only living members of jawless vertebrates, the most ancient lineage of vertebrates, and are therefore a crucial group
Are Ray Finned Fishes Jawed Vertebrates? The jawed vertebrates (gnathostomes) fall into two major taxa, the Chondrichthyes (cartilaginous fishes) and Osteichthyes (bony fishes). The latter taxon includes sarcopterygians (coelacanths, lungfishes, and tetrapods) and actinopterygians (ray-finned fishes). Are fishes jawed vertebrates? Gnathostomes or “jaw-mouths” are vertebrates that possess jaws. One of the most significant developments in