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Chapter 34 - C hapter 34 Vertebrates(Backbone Chordate...

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Chapter 34: Vertebrates (Backbone) Chordate Phylogeny – fig 34.2 CQ – Which of the following statements is not true? 1. All chordates have notochords 2. All chordates have pharyngeal Pouches 3. All chordates have a post-anal tail 4. All chordates have vertebrae Concept 34.1: Chordates have a notochord and a dorsal, hollow nerve chord Chordates are deuterostome bilaterian animals 2 chordate subphyla are invertebrates - Urochordata - Cephalochordata 3 rd subphylum Craniata includes the Vertebrates Derived Characters of Chordates – fig 34.3 All chordates share 4 derived characters Although some species possess some of these traits only during embryonic development Tunicates – fig 34.5 a&b Subphylum Urochodata – also known as tunicates or sea squirt Sessile marine suspension feeders - Draws water in through incurrent siphon, filtering food particles Tunicates possess the chordate characteristics during their larval stage (fig 34.5c) Lancelets – fig 34.4 Subphylum Cephalochordata Marine suspension feeders Retain chordate features throughout lifespan
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CQ – Which of the following is a diagnostic feature of tunicates that forms the basis for its classification as a chordate? 1. Metamorphosis from a motile larva to a sessile adult 2. A heart that allows circulation of blood 3. A notochord located along the dorsal part of the larva 4. Sexual reproduction during the larval stage Concept 34.2: Craniates are chordates that have a head Subphylum Craniata The origin of the head in chordates allowed some to become active predators Shared characters in craniates - Cranium - Brain - Eyes & Other sensory organs (allow them to process information from the environment) Hagfishes – fig 34.9 Class Myxini The lease derived extant species of Craniate Jawless, marine craniates Cartilagenous skull ( skull made of cartilage) & axial rod derived from notochord No vertebrae (live in deep ocean) (Side of the body has slime glands – when predator approaches, they releases slime glands) Concept 34.3: vertebrates are craniates that have a backbone They have
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- Vertebrae enclosing a spinal chord - An elaborate skull - Fin rays, in aquatic forms Lampreys – Fig 34.10 Class petromyzontida
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