WIS 2040 Final: Section 8

• School: University of Florida
• Department: Wildlife Ecology and Conservation
• Course: WIS 2040
• Professor: Michael P Moulton

Document Summary

Section 8: evolution of jaws; placoderms; class chondrichthyes; osteichthyes; shark finning and asian. Pleurodont dentition refers to the condition where the teeth are set in a groove in the jaw. Acrodont dentition refers to the condition where the teeth are set on top of the jaw modern jawed fishes include the class chondrichthyes and class osteichthyes. There are two types of chondrichthyes (chondr = cartilage, ichthyes = fish) elasmobranchii - the sharks, skates, rays. Sharks = viviparous and have low reproductive rates harvested for: cartilage and food. Certain skates and rays may lay eggs (oviparous) or retain the fertilized eggs in the reproductive tract (ovoviviparous) The monotremes are characterized by species that lay eggs holocephali - the ratfish. Finning was banned in us waters of the atlantic, caribbean, and gulf of mexico but not pacific. In 2014, oceana reported that 73 million sharks a year are killed for fins. December 21, 2000 clinton signed shark finning prohibition act.