Chapter 34

Chapter 34 - Chapter 34: Vertebrates (Backbone) Chordate...

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Unformatted text preview: Chapter 34: Vertebrates (Backbone) Chordate Phylogeny fig 34.2 CQ Which of the following statements is not t rue? 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 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- Vertebrae enclosing a spinal chord- An elaborate skull- Fin rays, in aquatic forms Lampreys Fig 34.10 Class petromyzontida...
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This note was uploaded on 03/18/2010 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Chapter 34 - Chapter 34: Vertebrates (Backbone) Chordate...

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