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Fish

Phylum Chordata. Fish. Subphylum Vertebrata: Vertebrae surround nerve cord and serves as a primary support ; skeleton modified into a skull for protection of the brain . This group includes fish, amphibians, reptiles, birds, and mammals Notocord is replaced by a vertebral column.

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Fish

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  1. Phylum Chordata Fish

  2. Subphylum Vertebrata: Vertebrae surround nerve cord and serves as a primary support; skeleton modified into a skull for protection of the brain. • This group includes fish, amphibians, reptiles, birds, and mammals • Notocord is replaced by a vertebral column.

  3. Superclass Agnatha: lack jaws and paired appendages; cartilaginous skeleton; persistent notochord Pouch lamprey, hagfish, and lamprey eel

  4. Other General Characteristics • - aquatic, scales, fins, and pharyngeal slits • Nervous system: well developed with brain and spinal cord • Control smell, sight, body movement • Vertebral column for protection • Chemoreceptors • Closed circulatory system –Heart ->ventricle->Aorta-> gills

  5. Excretory: Kidneys remove ammonia • Respiration: Gills: water in mouth, through gills, and out through gill slits- exchange Oxygen and CO2 • Some use lungs • Swim bladder- open space in fish to regulate buoyancy

  6. Feeding: • Herbivores, carnivores, filter feeders, detritivores, parasites • Pathway: Mouth->Esophagus->Stomach-> pyloric ceca->intestines->anus • Reproduction:dioecious • Oviparous: lay eggs, external fertilization • Oviviparous: young develop in mom, but are not nourished by mom • Viviparous- bare live young, nurtured by mom

  7. Classes of Fish ***Correction! • A: Myxini- Hagfish • B. Chondrichthyes- Cartilagenous fish and sharks • C. Osteichthyes- bony fish , 40 % of all vertebrates are bony fish • D. Petromyzontida- lampreys

  8. Classes of Fish • You will summarize the characteristics of the different classes of Fish providing the following information: • For CLASSES MYXINI,PETROMYZONTIDA, SARCOPTERYGII • 1) EXAMPLES • 2)MOUTH CHARACTERISTICS • 3)OLFACTORY SACS • 4)PHARYNGEAL SLITS (HOW MANY ? 1 OR MORE OPENINGS? • 5)FEEDING HABITS

  9. For classes Chondrichthyes and Actinopterygii • Examples • Digestion • Respiration • Skin • Skeletal system • Circulatory system • Swim bladder? • Movement (fins present and what kind?) • Reproduction methods

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