Paleozoic era invertebrates l.jpg
Sponsored Links
This presentation is the property of its rightful owner.
1 / 38

Paleozoic Era Invertebrates PowerPoint PPT Presentation


  • 558 Views
  • Updated On :
  • Presentation posted in: General

Paleozoic Era Invertebrates. Chapter 12 Part 1. Paleozoic Geology. 4 transgressions Major orogenies Mountain ranges form/oceans close + open Pangaea forms. Pre-Paleozoic life. Stromatolites Ediacaran fauna. End of the Paleozoic life. Cambrian climate.

Download Presentation

Paleozoic Era Invertebrates

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Paleozoic Era Invertebrates

Chapter 12 Part 1


Paleozoic Geology

  • 4 transgressions

  • Major orogenies

  • Mountain ranges form/oceans close + open

  • Pangaea forms


Pre-Paleozoic life

  • Stromatolites

  • Ediacaran fauna


End of the Paleozoic life


Cambrian climate

  • What is the climate like coming out of the Proterozoic?

  • Where are most of the continents located?


Cambrian

  • Animals with skeletons appear, abruptly

  • Cambrian explosion

  • Why?


Early Cambrian fossils

  • Shelly fauna

  • Several millimeters


Why develop a calcium skeleton in the Cambrian?

  • Precambrian oceans low in calcium carbonate (calcite)

  • Theory now rejected

  • How to disprove?


Why develop a calcium skeleton in the Cambrian?

  • Metabolic systems evolving

  • Organism needs to eliminate mineral matter

  • Secret excess ions as skeleton


Why develop an exoskeleton?

  • Advantages?


Wounded Trilobite

Cambrian predator and prey

  • Anomalocaris and trilobite


Marine communities

  • How things get around

  • Where they live

  • How they feed


Where marine animals live/how they move

  • Organisms live above seafloor are pelagic

    • Plankton are floaters

    • Nekton are swimmers


Where marine animals live/how they move

  • Organisms live above seafloor are pelagic

    • Plankton are floaters

    • Nekton are swimmers

  • Animal plankton: zooplankton

  • Plant plankton: phytoplankton


Where they live/how they move

  • Organisms live in/on seafloor are benthonic

  • Infauna (live in sediment)

  • Epifauna (animals)

  • Epiflora (plants)

  • Can be sessile (stationary)

  • Or mobile


Feeding style

  • Suspension feeders: catch food from water (plants, animals, nutrients)

  • Sediment-deposit feeders: ingest sediment

  • Herbivores: plant eaters

  • Carnivore/scavenger: meat eaters


Description

  • Benthonic, epifaunal, suspension feeder

  • Animal lives on seafloor and removes food from water


Cambrian marine community

  • Cambrian explosion

  • Experimentation!


Famous Cambrian fossil locations

  • Burgess Shale, British Columbia

  • Sauk Sea transgressing


  • Sands covered with black mud

  • Shale preserved benthonic, soft-bodied community


Why there?

  • Avalanche of mud off edge of coast trapped shallow-water creatures

  • Fine mud let soft-bodies be preserved


Trilobites

  • Appear in the Cambrian

  • Benthonic, mobile, sediment-deposit feeders


Trilobites

  • Member of arthropod phylum

  • Exoskeleton

  • Distinct parts to body

  • Jointed appendages


Trilobites

  • Member of arthropod phylum

  • Exoskeleton

  • Distinct parts to body

  • Jointed appendages


Trilobites

  • Max diversity by Late Cambrian


Trilobites

  • Extinction at end of Cambrian

  • Increased competition?

  • Increased predation?

  • Loss of habitat?

  • Cooling seas?


Cambrian Brachiopods

  • Two-shelled animals

  • Benthonic, sessile, suspension feeders

  • Inarticulate: muscles held shells together


Inarticulate Brachiopod

  • Two-shelled animals

  • Benthonic, sessile, suspension feeders

  • Inarticulate: muscles held shells together


Cambrian Archaeocyathid

  • Benthonic, sessile, suspension feeders

  • Built reef-like structures


Cambrian Archaeocyathid

  • Benthonic, sessile, suspension feeders

  • Built reef-like structures


Other fauna

  • Arthropod from Burgess shale


Other fauna:

  • Short-lived evolutionary experiments

  • Anomalocaris

  • Up to 3 feet long

  • Major predator


Other fauna:

  • Short-lived evolutionary experiments

  • Helicoplacus: extinct 20 Ma after appeared


Marella, < 1 inch


Halluciginia


Arthropod-like creature


Cambrianscaly slug


Paleozoic life

  • Cambrian Explosion

    • Exoskeleton

    • Experimentation

  • Animals to know:

    • Trilobite

    • Brachiopod

    • Archaeocyathid


  • Login