Fungi, Animalia

Fungi, Animalia - Phylum Chordata Origin = most likely a...

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Unformatted text preview: Phylum Chordata Origin = most likely a larval stage more ancient than the current Echinoderms ? Hemichordates Vertebrates ~0.5 to 1 BYA 1. Bilateral symmetry 2. triploblastic’ 3. Partially segmented 4. Complete digestive tract 5. Enterocoelic 6. Deuterostomate with radial cleavage Specific characteristics 1. Pharyngeal gill slits – through body from gut to external surface 2. Hollow dorsal nerve cord as opposed to ventral cord in most invertebrates 3. Notochord = flexible rod along the dorsal surface serves structural support 4. Internal skeleton • Protochordates notochord is main skeletal feature • Agnatha jawless fish spinal cord replaces notochord Neural arch Spinal cord Intervertebral discs Centrum Dorsal blood vessel Neural arch Spinal cord Centrum Hemal arch = gives rise to ribs Dorsal blood vessel Jaw development Agnatha no jaws filter feeder or parasite Placoderms Unusual variable jaws & teeth predator Condrichthyes & Osteichthyes jaws and teeth Jaws free from skull Lungfish upper jaw fused with skull Adaptations...
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This note was uploaded on 12/09/2009 for the course BIO 200 taught by Professor Herreid during the Spring '07 term at SUNY Buffalo.

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Fungi, Animalia - Phylum Chordata Origin = most likely a...

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