Lecture 22 - Vertebrata - Fish

Lecture 22 - Vertebrata - Fish - Lecture 22 - Vertebrata...

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Lecture 22 - Vertebrata – Fish A. Vetebral features 1. vertebral column a. notochord – have this when we are embryos but it turns into vertebral column when we grow b. vertebrae c. nerve cord - d. cranium - encloses and protects brain, spinal cord is protected e. brain – anterior portion of nerve cord that controls all functions 2. Endoskeleton - all vertebrates have an endoskeleton (a living tissue that grows with you) 3. Pronounced cephalization - there are a lot of sensory organs in the head area B. Cephalospidomorphi (agnatha= “jawless fish”) - Superclass name for all fish – Pisces; there are only five classes of fish left 1. Jawless fish (fig.31-9) – (primitive) they aren’t active predators 2. Cartilagenous skeleton - primitive 3. No paired fins – paired fins are another thing active predators need; they don’t have much control 4. Scaleless 5. Heart – has a closed circulatory system; the heart has 2 chambers (this is primitive, it is not very efficient in separating oxygenated and deoxygenated blood (no separation) 6. Lampreys (only thing in this group); it has an elongated body and horny teeth inside the mouth and on the tongue (because lampreys
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Lecture 22 - Vertebrata - Fish - Lecture 22 - Vertebrata...

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