notes-2-1 - 2/1/10...

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2/1/10 Subclass- Elasmobranshii  (plate gill) (skates and rays and sharks) 1. Sharks a. Feeding- Mouth rimmed with re-curved teeth i. Very similar to placoid scales ii. Probably evolved from scales iii. Rows of replacement teeth (conveyer belt) iv. Mouth- subterminal- under snout Both upper and lower jaw move up/down/backwards/forwards (relatie to brain  case v. Cranial kinesis b. Largest shark- whale shark (20m) i. Largest living vertebrate after baleen whates c. Filter-feed – krill 2. Skates and Rays a. Bottom dwelling b. Very flat c. Very enlarged pectoral fins d. e. (mantas- filter feeders) f. Respiratory current- H20 i. In through spiracles (dorsal) ii. Out ventral gill slits g. Electric rays- electric organ in tail i. Severe shock ii. Stun prey, enemies h. Stingrays- rows of spines on tail  venom delivered Sublcass Holocephali- Chimaeras
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This note was uploaded on 03/27/2010 for the course ZOL 328 taught by Professor Hill during the Spring '08 term at Michigan State University.

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notes-2-1 - 2/1/10...

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