The evolution of jaws allowed early gnathostomes to exploit food resources that were unavailable to jawless fishes. A jawless fish is a fish without a jaw. The lamprey is an example of a jawless fish. Myxinides and Order 2. Hagfishes and lampreys, both examples of jawless fishes, are elongated, eel-like animals lacking paired fins, and are the only living representatives of ancient creatures that gave rise to current species of fish and, eventually, humans. Dunkleosteous was an enormous placoderm from the Devonian period, 380–360 million years ago. Members of the agnatha class are probably the earliest vertebrates. It measured up to 10 meters in length and … Lampreys and hagfish are in this class. These fish were the first vertebrates to evolve. You can probably guess. Figure 1. Myllokumingia had a head and trunk, a dorsal fin, a ventral fin (that might have been paired), 5-6 gill pouches, around 25 muscle segments (myomeres), a pharynx, an intestine, a notochord, and perhaps a pericardial cavity. ADVERTISEMENTS: E. S. Goodrich (1909) gave the […] ; Latimeria: Living fossil. Jawless Fishes. Hagfishes are minor pests of commercial food fisheries of the North Atlantic, but lampreys, because Learn term:class example = jawless fish, hagfish with free interactive flashcards. Torpedo (Electric Ray) : Carnivorous fish, have a pair of electric organ for defense and predation. What defines a jawless fish? Two jawless fish are known from the Early Cambrian. Order 1. ; Trygon (Sting ray): Whip like tail, modified into stinging organ, armed with saw edged spines or stinger with venom glands, There wounds are very painful and heal slowly. But there are other features that are shared by this class of organisms. Agnathan, (superclass Agnatha), any member of the group of primitive jawless fishes that includes the lampreys (order Petromyzoniformes), hagfishes (order Myxiniformes), and several extinct groups. Scientists have found fossils of agnathan species from the late Cambrian Period that occurred 500 million years ago. An "Example of" Reference Site. A jawless fish is a fish without a jaw. ADVERTISEMENTS: In this article we will discuss about the historical resume and classification of jawless vertebrates. Choose from 10 different sets of term:class example = jawless fish, hagfish flashcards on Quizlet. Connecting link between fishes and amphibians. What defines a jawless fish? Why would such an organism evolve? These fish were the first vertebrates to evolve. But there are other features that are shared by this class of organisms. The lamprey is an example of a jawless fish. You can probably guess. Why would such an organism evolve? 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