GEOL 200 Lecture Notes - Lecture 1: Carnivora, Chondrichthyes, Cetacea

• School: Queen's University
• Department: Geological Sciences and Geological Engineering
• Course: GEOL 200
• Professor: Noel P James

Document Summary

Chondrichthyes: larger group that agnatha, sharks and rays, no bones, just cartilage, only fossil record (except for exceptional circumstances) is their teeth, generally larger than boney fish, 700 species, almost all marine, negatively buoyant. Osteihthyes: boney fish, ~27,00 species in the ocean, hard, strong, lightweight skeleton, gas filled bladders, moveable fins, can travel at high speeds, some camouflage, social organization (schools), migratory, baracuda attracted to shiny things, extremely fast, predators, reef fish small in size, very territorial, will attack, parrot fish eat coral, haddock born with 2 eyes, 1 on each side. Saltwater fish: water and salt gained by drinking, salt excreted via gills, minimal water loss in urine, concentrated urine (cid:1) (cid:1) (cid:1) (cid:1, water loss by osmosis concentration inside fish is higher than outside fish must continuously drink. Sea turtles: birds of the water , 85 90 species, no predators (except humans) because they can retract their head and fins, navigate remarkable distances.