ROBERTS Download 17

ROBERTS Download 17 - Download 17 Animals (part 2) Intro to...

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Unformatted text preview: Download 17 Animals (part 2) Intro to Ecology Principles of Biology BIOL 1543 Greig Roberts, DDS Office: SCEN 417 E-Mail: groberts@uark.edu 2 Our own phylum, the chordates, is distinguished by four features Chordates have A dorsal hollow ner ve cord A stiff notochord Pharyngeal slits A muscular post-anal tail The simplest chordates are tunicates and lancelets, marine invertebrates that use their pharyngeal slits for suspension feeding. Most chordates are vertebrates with a head and a backbone made of vertebrae. Phylum: CHORDATA 3 Derived characters define the major clades of chordates Chordates Craniates Vertebrates Jawed vertebrates Tetrapods Amniotes Milk Amniotic egg Legs Lobed fins Lungs or lung derivatives Jaws Vertebral column Head Brain Ancestral chordate Tunicates Lancelets Hagfishes Lampreys Sharks, rays Ray-finned fishes Lobe-fins Amphibians Reptiles Mammals 4 Lampreys are vertebrates that lack hinged jaws and paired fins. Class: Lampreys 5 Derived characters define the major clades of chordates Chordates Craniates Vertebrates Jawed vertebrates Tetrapods Amniotes Milk Amniotic egg Legs Lobed fins Lungs or lung derivatives Jaws Vertebral column Head Brain Ancestral chordate Tunicates Lancelets Hagfishes Lampreys Sharks, rays Ray-finned fishes Lobe-fins Amphibians Reptiles Mammals 6 Most vertebrates have hinged jaws, which may have evolved from skeletal supports of the gill slits. Gill slits Skeletal rods Skull Mouth 7 Jawed vertebrates with gills and paired fins include sharks, ray-finned fishes, and lobe-finned fishes These three lineages of are collectively commonly called fishes . (Fishes is appropriate when referring to more than one type of fish. Fish is plural when referring to multiple individuals of the same type.) 8 Jawed vertebrates with gills and paired fins include sharks, ray-finned fishes, and lobe-finned fishes These three lineages of are collectively commonly called fishes . (Fishes is appropriate when referring to more than one type of fish. Fish is plural when referring to multiple individuals of the same type.) 9 Chondrichthyans have a flexible skeleton made of cartilage but do not have a swim bladder. They include sharks and rays....
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ROBERTS Download 17 - Download 17 Animals (part 2) Intro to...

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