Jawless Fish. ; 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. A jawless fish is a fish without a jaw. Members of the agnatha class are probably the earliest vertebrates. Learn term:class example = jawless fish, hagfish with free interactive flashcards. Why would such an organism evolve? 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. Torpedo (Electric Ray) : Carnivorous fish, have a pair of electric organ for defense and predation. What defines a jawless fish? Figure 1. ; Latimeria: Living fossil. The evolution of jaws allowed early gnathostomes to exploit food resources that were unavailable to jawless fishes. But there are other features that are shared by this class of organisms. Jawless Fish. One class of fishes—the class Cyclostomi—is best known from the fossils of its extinct members that lived from Ordovician to Devonian times, some 500 to 400 million years ago. It measured up to 10 meters in length and … Historical Resume: L. Agassiz (1857) placed the agnaths under the class Myzontes and proposed the following scheme for the lampreys and hagfishes: Class I. Myzontes. Hagfishes are minor pests of commercial food fisheries of the North Atlantic, but lampreys, because Lampreys and hagfish are in this class. 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. Why would such an organism evolve? Myxinides and Order 2. Members of this class of fish … Jawless Fishes. Agnatha are jawless fish. Order 1. ADVERTISEMENTS: E. S. Goodrich (1909) gave the […] The lamprey is an example of a jawless fish. Cyclostomi. ADVERTISEMENTS: In this article we will discuss about the historical resume and classification of jawless vertebrates. The lamprey is an example of a jawless fish. Dunkleosteous was an enormous placoderm from the Devonian period, 380–360 million years ago. But there are other features that are shared by this class of organisms. A jawless fish is a fish without a jaw. Scientists have found fossils of agnathan species from the late Cambrian Period that occurred 500 million years ago. Although all fishes are primarily aquatic, cold-blooded, backboned animals, there are fundamental differences among them. These fish were the first vertebrates to evolve. An "Example of" Reference Site. What defines a jawless fish? You can probably guess. 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. 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