Classification of Fish

Whitney eastside Mr. Be completely Speech 1200 October 24, 2012 Outline Topical Classifying look for Specific Purpose To inform my earr distri besidesively about the different compartmentalisations of slant. Central thinker Fish argon twelvemonthified by their different characteristics which sorts them into different bodes like Agnatha, Chondrichthyes, and class Osteichthyes. origin I. Classification of living things helps people to recognise how living organisms whitethorn or may not be related to from each one another(prenominal). A. The system of classification we intake directly was invented 200 years ago by Carl Linnaeus.B. Carl Linnaeus system of classification groups organisms by their characteristics or features they ingest in common. II. According to the set aside vertebrate Biology by ORR Robert Fish, mammals, reptiles, birds, and adeninehibians are categorise together as vertebrates because they all name an internal backbone. III. In researching this extra topic, I learned that the most great characteristics used in slant classification are the attribute of bone in their framing, the gill structure, the number and shape of fins, and the type of scales. IV.Now I will introduce you to the characteristics and the triple different classes of slant. Jawless (Agnatha), Cartilaginous (Chondrichthyes), and nasal Fish (Osteichthyes). Body I. The Agnatha class is the oldest group, similar to weight but with most different characteristics. A. As explained in The developing of Vertebrate Design, certain characteristics like scatty jaws is what classified lean to this class. 1. The Agnatha class lacks an internal bone skeleton, jaws, and paired fins. 2. kind of of jaws, they shed circular toothed mouths called cyclostomic. Which they use to suck blood from the side of their guttle. . They ca-ca a smooth, scale less cutis which is soft to the touch. B. There are dickens living groups of Agnatha the lampreys and Hag lean 1. lamprey eel harbor a iodin abaxial nostril, a pineal eye, three fins (anterior, posterior, and taillike fin), and a long row or circular gill pouch openings. They entertain a living being a parasite that eventually kills the prey they secure onto. 2. Hagfish open long eel-like bodies, no eyes, no accredited fins, a single nostril, up to eight barbels (like whiskers/tentacles for fish) and have rows of horny teeth used to postponement food and draw it in. II.Chondrichthyes fish directly include both fearsome caribe characteristics and harmless characteristics. A. As explained in Vertebrate Biology, all Chondrichthyes lack true bone. 1. The Chondrichthyes fish have full(a) cartilage skeletons. 2. They have teeth that are made of calcium which grow in rows throughout the fishs life. 3. They have a regular pattern of fins and thither external skin is entirely cartilaginous. B. Sharks, skates, and rays addle up the Chondrichthyes class. 1. Sharks have pointed snouts and rou nded shaped mouths with several rows of sharp three-sided teeth.They have five gills on each 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 radix of their tail. The mouth and gills are on the freighter of their bodies. Skates are bottom dwellers and trap their prey by dropping down on their prey from above. 3. Rays can be classified into the following groups electric rays, sawfish, skates, and many families of rays that have slender whip like tails. III. The Osteichthyes ( cadaveric 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. penurious fish have a much stiffer skeleton because it is reinforced by calcium salts. 2. Bony fish also have acute eyesight unlike other classes of fish 3. Bony fish have a special organ called a be adrift bl atter housed under their bony skeleton is a gas filled chamber that allows the fish to remain floating in the water. B. tuna fish and Seahorses are examples of bony fish (Osteichthyes) 1. The tuna is stout in the middle and tappers to points at both ends.The tuna had two fast spaced dorsal fins on its back. The tuna is generally metallic dark aristocratical color on its sides and silvery on its underside. 2. The seahorse has a heavy bony armor which makes them poor swimmers. They mostly secure 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. purpose I. An animal is not a fish unless it has all the right characteristics II. No depicted object 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 encyclopedism about different groups of fascinating fish around the world.Bibliography Animal Planet. N. p. , n. d. Web. 23 Oct. 2012. &lthttp//animals. howstuffworks. com/fish/fish-info5. htm&gt. ORR, ROBERT T. VERTEBRATE BIOLOGY. ordinal ed. PHILADELPHIA W. B. SAUNDERS, 1976. Print. Radinsky, Leonard B. The Evolution of Vertebrate Design Leonard B. Radinsky. pelf University of Chicago, 1987. Print. Savage, Stephen. Fish. Austin,Texas Raintree, 2000. Print. Wallace, Holly. Classification. Chicago Heinemann Library, 2000. Print.