L11 Appendicular skeleton

L11 Appendicular skeleton - Appendicular skeleton Pectoral...

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Appendicular skeleton Pectoral girdle, pectoral appendages Pelvic girdle, pelvic appendages
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Most jawless fish inc. hagfish & lampreys – no paired fins, bottom feeders, early evolved heavily armoured. • But some do – muscular flap behind head! These heavy fish became more active & produced fins
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Fin-fold hypothesis
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Pectoral girdle mostly from dermal plates in early jawed fish e.g. +Placoderms And this still remains in present day bony fish
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scapulocoracoid, pelvic girdle basal pterygiophores – 3 pectoral, 2 pelvic radial pterygiophores ceratotrichia Pectoral = tribasic fin
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Narrow base, fan shaped fins characteristic of Actinopterygians (ray-finned fish) e.g. Polypterus tribasic lepidotrichia Girdle = scapula, coracoid Dermal = cleithrum, clavicle (lost in later actin), supracleithral, postcleithral, posttemporal (anchors to back of skull) Pelvic girdle = 2 small plates, no articulation with vertebral column
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Sarcopterygians (lobe-finned fish), single basal pterygiophore, called monobasic fins
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This note was uploaded on 08/28/2011 for the course ZOO 3713c taught by Professor Staff during the Spring '08 term at University of Florida.

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L11 Appendicular skeleton - Appendicular skeleton Pectoral...

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