Life in the Paleozoic Ocean Planet & The Great Migration Ocean Planet & The Great Migration.

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Presentation transcript:

Life in the Paleozoic Ocean Planet & The Great Migration Ocean Planet & The Great Migration

Paleozoic Myr Early Middle Late

Skeletons and Shells Small Shelly Fossils (SSF’s) (Very) Late Proterozoic

Shells & Skeletons: Advantages of Hard Parts 1.Protection from UV - survive in shallow water 2.Prevents drying out - intertidal zone 3.Predator protection 4.Provides support - inc. size 5.Potential to build reefs Advantage to us - make better fossils!

Planet Ocean Early Paleozoic Ray Troll

Major Animal Phylum All originate in the Early Paleozoic

Marine Lifestyles Pelagic (“Open Water Dwellers”) Deep or Shallow Benthic (“Bottom Dwellers”)

Pelagic Lifestyles Plankton (“Drifters”) Nekton (“Swimmers”)

Benthic Lifestyles Epifaunal (“Above Ground”) Infauna (“Below Ground”)

Cambrian Fossils

Burgess Shale Ray Troll

“Jump” in Diversity

Cambrian Explosion

Wiwaxia

Hallucigenia © 2003 by Karen Carr

Opabinia

Anomalocaris

Pikaia (early Chordate)

Trilobites (Arthropods)

Trilobite Eye

Other Arthropods (Chengjiang, China)

Porifera (Sponges)

Animation

Sponge Spicules

Fossil Paleozoic Sponge

A Semi-Colonial Ancestor to all Animals?

Cnideria (Corals & Jellyfish)

Types

Corals

Order Tabulata (Extinct)

Order Rugosa (Horn Corals) (Extinct)

Order Scleratina (Hexacorals)

Bryozoans (Moss Animals)

Lacy Bryozoans

Freshwater Bryozoan

Bryozoan Colony First Fossils: Ordovician

Fossil Bryozoan

Graptolites

Dendroid

Graptoloid

Mollusks Ordovician Cephalopods Ordovician Gastropods

Brachiopods (Lamp Shells)

Annelids (Segmented Worms) Cambrian (China)

Echinoderms

What Led to the Cambrian Explosion? Hard Parts? Predators?