Classification of Fish

Whitney East Mr. Beall talk 1200 October 24, 2012 Outline Topical Classifying slant Specific Purpose To inform my hearing about the different sortings of fish. Central Idea Fish are classify by their different characteristics which sorts them into different classes want Agnatha, Chondrichthyes, and Osteichthyes. Introduction I. Classification of liveliness things helps people to understand how living organisms may or may non be related to each other. A. The system of classification we use straightaway was invented 200 years ago by Carl Linnaeus.B. Carl Linnaeus system of classification groups organisms by their characteristics or features they get down in common. II. According to the book Vertebrate biota by ORR Robert Fish, mammals, reptiles, birds, and amphibians are classified together as vertebrates because they all make an internal back os. III. In researching this particular topic, I learned that the most all important(p) characteristics used in fish classification are the type of beat in their skeleton in the cupboard, the gill structure, the number and shape of fins, and the type of scales. IV.Now I ordain introduce you to the characteristics and the three different classes of fish. Jawless (Agnatha), Cartilaginous (Chondrichthyes), and pinched Fish (Osteichthyes). Body I. The Agnatha class is the oldest group, similar to fish but with close to different characteristics. A. As explained in The Evolution of Vertebrate Design, certain characteristics like inadequacying jaws is what classified fish to this class. 1. The Agnatha class lacks an internal bone skeleton, jaws, and paired fins. 2. Instead of jaws, they use up peak toothed mouths called cyclostomic. Which they use to eviscerate blood from the side of their prey. . They have a smooth, scale less come up which is soft to the touch. B. There are two living groups of Agnatha the lampreys and crone 1. Lamprey have a single abaxial nostril, a pineal eye, three fins (anterior, post erior, and caudal fin), and a great row or circular gill pouch openings. They make a living being a parasite that eventually kills the prey they latch onto. 2. Hagfish have long eel-like bodies, no eyes, no true fins, a single nostril, up to eight-spot barbels (like whiskers/tentacles for fish) and have rows of horny teeth used to grasp nourishment and draw it in. II.Chondrichthyes fish today include both fearsome predatory animal characteristics and harmless characteristics. A. As explained in Vertebrate Biology, all Chondrichthyes lack true bone. 1. The Chondrichthyes fish have full cartilage skeletons. 2. They have teeth that are made of calcium which grow in rows passim the fishs life. 3. They have a regular pattern of fins and in that respect external skin is entirely cartilaginous. B. Sharks, skates, and rays make up the Chondrichthyes class. 1. Sharks have pointed snouts and crescent shaped mouths with several rows of sharp triangular teeth.They have louvre gills on ea ch side that have individual gill slits shown externally. 2. Skates are rounded to diamond shaped. They have large pectoral fins extending from the snout to the bastardly of their tail. The mouth and gills are on the underside of their bodies. Skates are bottom dwellers and block their prey by dropping down on their prey from above. 3. Rays stinker be classified into the following groups electric rays, sawfish, skates, and many families of rays that have elegant whip like pursue. III. The Osteichthyes (bony fish) is the largest class of vertebrates with over 20,000 species.A. Stephen Savage states in the book Fish that, Osteichthyes have skeletons made of bone, flat scales, and gills. 1. Bony fish have a much stiffer skeleton because it is reinforced by calcium salts. 2. Bony fish also have acute beholding unlike other classes of fish 3. Bony fish have a special organ called a swim blatter housed under their bony skeleton is a gas filled chamber that allows the fish to remain afloat(p) in the water. B. Tuna and Seahorses are examples of bony fish (Osteichthyes) 1. The tuna is intrepid in the middle and tappers to points at both ends.The tuna had two nearly spaced dorsal fins on its back. The tuna is generally metallic downhearted blue color on its sides and silvery on its underside. 2. The seahorse has a heavy bony armor which makes them poor swimmers. They mostly anchor themselves with their tails to things like seaweed or other kinds of plants. They have a transparent dorsal fin on its back that propels them forward. Conclusion I. An animal is not a fish unless it has all the right characteristics II. No matter how different fish are, most fish share several basic characteristics fins, gills, scales, and hatch babies from eggs. III.Fish classification is sometimes confusing and difficult, but it is a useful way of schooling about different groups of fascinating fish around the world.Bibliography Animal Planet. N. p. , n. d. Web. 23 Oct. 2012. <h ttp//animals. howstuffworks. com/fish/fish-info5. htm>. ORR, ROBERT T. VERTEBRATE BIOLOGY. FOURTH ed. PHILADELPHIA W. B. SAUNDERS, 1976. Print. Radinsky, Leonard B. The Evolution of Vertebrate Design Leonard B. Radinsky. cabbage University of Chicago, 1987. Print. Savage, Stephen. Fish. Austin,Texas Raintree, 2000. Print. Wallace, Holly. Classification. Chicago Heinemann Library, 2000. Print.