Paleozoic Life

Paleozoic Life - Paleozoic Life Early life Fossil record...

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1 Paleozoic Life Early life • Fossil record increases with increase in fossil hard parts. • Vertebrates evolve. • Animals move onto land. • Vascular plants show up. • Also largest mass extinction –EVER. Precambrian-Cambrian Invertebrate phyla Early Cambrian fossils • Also found in Vendian. • These were very small and originally overlooked. Early Cambrian fossils
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2 Proterozoic-Cambrian boundary The Cambrian explosion • Fossils found all over the world that show incredible diversity and abundance. • Many animals already highly evolved. • All major phyla found except for Bryozoa. • Occurred in Tommotian epoch. Some of the animals… Anomalocari s -2 feet long! Top predator of the early Cambrian. • Many early arthropods Marella , Opabinia . • Various annelid worms Hallucigenia. • Earliest Chordates! Pikaia and Myllokunmingia Anamalocaris and Hallucigenia Marella and Opabinia
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3 Pikaia & Myllokunmingia What is so special about this? • Very well preserved fossils - – anoxic environment. • Soft bodied and hard bodied organisms. • Animals lived on continental shield BUT did not fossilize there! • Shows high complexity of species. • Some animals were experimental, while some have ancestors today Cambrian trilobites Cambrian to Ordovician • Ordovician by a 3X increase in biodiversity over the Cambrian. • Organisms evolved to Ft new niches. – Epifaunal and infaunal – ±irst record of bioturbation Protistans • Organisms composed of one cell. • Had hard parts. • ±oraminifera – Nummulites • Radiolarian
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4 Marine Invertebrates -Reef Builders • Archeocyanthids • Porifera • Cnidaria • Bryozoa • Brachiopods Archeocynathids • Similar to sponges and corals. – But not either • TWO layered outer wall. Phylum Porifera -sponges • THREE layered outer wall. – Endoderm – Ectoderm – Mesoglea Evolution of Porifera sponges
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5 Stromatoporoids • Only found in Paleozoic. • Related to sponges. Phylum Cnideria • Includes corals, sea anemones, sea fans, jellyFsh. • Either a medusa or a polyp. • Composed of cnidocytes. • Good for paleoenvironment. Types of Cnidarians Some Paleozoic corals Bryozoa • Colonial animals -NOT related to corals. • Each animal is called a zooid. • Reef building. • ±irst representative individuals were soft- bodied –in the Precambrian. • Related to PHORONIDA. – These possess lophopohore
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6 What is a lophophore? • U-shaped digestive tract. – All have a circular fold of the body that encircles the mouth and tentacles. • A fan-like Flter feeding adaptation. lophophore
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Paleozoic Life - Paleozoic Life Early life Fossil record...

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