Paleozoic Life Paleozoic Vertebrate Introduction Paleozoic Vertebrate Fish Evolution Paleozoic Vertebrate Fish Evolution Paleozoic Vertebrate Devonian Seafloor
Bogen, Brady, Host/Producer has reference to this Academic Journal, PHwiki organized this Journal Paleozoic Life Vertebrates & Plants Paleozoic Vertebrate Introduction Vertebrate evolution Transition from H2O to l in addition to Time of major extinctions (end of Paleozoic Era) Fish amphibian reptile Plants preceded animals Method of reproduction Evolution of the seed = plants Amniote egg = animals Marine invertebrates Many amphibians in addition to reptiles Paleozoic Vertebrate Fish Evolution Ancestors Similar to amphibians May have evolved from sessile suspension feeders Class Agnatha Jawless fish Class Acanthodians 1st Jawed fish
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Most primitive vertebrate – fish Paleozoic Vertebrate Fish Evolution Oldest fish Upper Cambrian Phosphatic; Jawless fish, class Agnatha Earliest non-marine Silurian Shallow near-shore marine deposits Paleozoic Vertebrate Devonian Seafloor Paleozoic Vertebrate Evolution of Jaws Major Advancement Active predators Eat plants New niches Evolutionary Opportunism Early jaws as long as respiration Open mouth wider; more O2 Led to food consumption Class Acanthodians L. Silurian Extinct Permian
Paleozoic Vertebrate Late Devonian Seafloor Paleozoic Vertebrate Cartilaginous & Bony Fish Class Chondrichthyes (cartilaginous) Related to sharks, rays, skates Primitive sharks L. Devonian Devonian Class Osteichthyes (bony fish) Devonian Two groups Ray finned Lobe finned Paleozoic Vertebrate Bony Fish Ray finned Lobe finned Thin bone spread from body Fresh-H2O beginning Trout, bass Muscular fins; no radiating fins Articulating bones 2 types of lobe-finned
Lobe-Finned Types Paleozoic Vertebrate 2 Types of Lobe-Finned Lung Fish Crossopterygians Lungs evolved from sac-like bodies Adapted as long as H2O variations Amphibian evolution Most important Paleozoic Vertebrate Lobe-finned & Amphibian Similarities 1st Vertebrates on l in addition to L. Devonian Paleozoic Vertebrate Amphibians Plants 1st l in addition to organisms Spiders in addition to insects be as long as e vertebrates
Major Barriers Paleozoic Vertebrate Transition from H2O to L in addition to Dessication Reproduction (need H2O) Effects of gravity Extraction of O2 from atmos. Crossopterygians overcame Barriers Backbone Limbs Lungs Amphibians exploit new niches Amphibians limited to colonizing l in addition to Paleozoic Vertebrate Evolution of Reptiles Gelatinous egg laid in H2O Amniote egg Led to colonization all parts of l in addition to Embryo surrounded by liquid Miniature adult Anion provided yolk (food sac) Bypass larval stage No need to return to H2O Paleozoic Vertebrates Reptiles Reptiles evolve in Late Mississippian Protorothyrids = earliest reptiles Diversified in Permiandisplaced amphibiansmore successful Pelycosaurs evolve from protorothyrids Extinct in Permian Pelycosaurs succeeded by therapsids Mammal-like reptile Both carniverous in addition to herbivorous Endothermicwarm-bloooded Could occupy both cold in addition to warm nicheshigh in addition to low latitudes 2/3 reptiles in addition to aphibians extinct at close of Permian.
Marine fresh H2O l in addition to Paleozoic Vertebrate Plant Evolution Problems to solve Dessication Support Effects of gravity Vascular (seedless) Non-Vascular Earliest plants mid-late Ord No specialized cells Live in low, moist areas Specialized cells Movement of H2O Earliest middle Silurian Reproduction (needs H2O) Gymnosperms (flowerless seed plants) Paleozoic Vertebrate Seed Evolution Late Devonian Seed plants no longer restricted to wet areas Male in addition to female cones Major source of worlds coal Paleozoic Vertebrate Permian Floras Results from alteration of plants living in low, swampy areas
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