ISB Exam 3 - ISB Exam 3 Diversification in the Oceans:...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
ISB Exam 3 I. Diversification in the Oceans: Paleozoic invertebrates A. Corals 1. made out of calcium carbonate; blossom in the tropics (very warm, shallow water) 2. Need “little algae” to survive and can’t grow above 40 degrees latitude 3. However, there is evidence that corals exist in Michigan. The only way this is possible is if Michigan used to be down near the equator B. Brachiopods 1. Early in the Paleozoic, brachiopods were very abundant. However, due to the fact that fish became predators later in the Paleozoic and the fact that the brachiopods could only use their shell as a defense mechanism,(and not dig into the sand like modern day clams), the brachiopod population became virtually non-existent 2. Still exist today but in small numbers C. Cephalopods 1. Squid-like animals with shells 2. Squids and octopuses today virtually gave up their shell in order to swim faster and have developed other defense mechanisms D. Trilobites 1. Trilobites developed a wide range of roles/niches in the environment 2. Hard exoskeleton; similar to a rolie-polie bug today E. Eurypterids 1. Arthropods as well 2. Predators, also referred to as sea scorpions 3. Very large arthropods (range from 1 foot to 12 feet) 4. Fish evolved and ate their food source, eurypterids ate them F. Crinoids 1. Kind of like starfish on a stalk
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2. Have survived to the Cenozoic era (today). This is possible because the Crinoids of today have the ability to break off their stalk in order to chase food. They can then re-attach their stalk in another spot. II. Cambrian Period (544 million to 505 million years ago) III. Ordovician period (505-438 million years ago) IV. Silurian Period (438-408 MY) ** All include the same relative species and that trend continues throughout the Paleozoic, at least in the oceans. V. Devonian (408-360 MY) A. Beaches of NW Michigan and the Petoskey stone 1. Fossil of coral in reality 2. Only found in NW Michigan VI. The evolution of fish A. agnatha (jawless fish) and lamprey 1. no jaws and sucking leech like mouth 2. no armor B. Oldest fish = Ostracoderms 1. No jaws 2. Hard armor protecting their entire body C. Placoderms 1. Fish with jaws 2. Now fish are recognized as serious predators 3. Incredibly large fish with very large teeth 4. The evolution of the jaw is the single most important thing that has happened to the development of fish D. Chondrichthyes = sharks and rays 1. Sharks a. Contrary to popular belief, sharks do evolve like all other species
Background image of page 2
b. Sharks are the ultimate predator, and their only threat is man c. Also contrary to popular belief, punching sharks in the nose doesn’t work. If the shark wants to kill you, it will. 2. Rays a. Teleost fish: Ray-finned (very complex skeletal structure) b. Crossopterygians: lobe-finned i. fresh water fish ii. Latimeria – lobed finned fish still exist today; living in deep water VII. (11/05/07) Pre-adaptations A. What does it take to evolve from a fish to a tetrapod (animal with 4 limbs)? B. Pre adaptation #1– something designed for something else turns out to benefit the animal
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/19/2008 for the course ISB 201 taught by Professor Besaw during the Fall '08 term at Michigan State University.

Page1 / 17

ISB Exam 3 - ISB Exam 3 Diversification in the Oceans:...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online