Animals 5 - How is the typical "posture" of a...

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1 How is the typical “posture” of a fish different from that of a land animal? Girdles and limbs Fig. 34.2, page 672 Limbs • The limbs are the distal portions of the appendicular skeleton . • They typically consist of a combination of long and short bones attached to the limb girdles . • The limbs of fishes, birds, and mammals are quite different. Each has a similar plan that has been modified to better serve a particular function. • Internal vs. external muscles, tendons, etc. The girdles • The limb girdles form the foundation for the movement of the limbs. • The pectoral girdle (scapula and clavicle) is connected to the forelimbs • The pelvic girdle (pelvis) attaches to the hindlimbs • Together with our limbs, the girdles form the appendicular skeleton . Relationships and important evolutionary features of gnathostomes (jawed vertebrates)
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2 Timeline of evolution for the major groups of craniate chordates How is the typical “posture” of a fish different from that of a land animal? Ostracoderms • First vertebrates, and first fishes • Jawless, covered with bony armor • Large, pad-like, muscular paired fins • Fins attached to the rear of the head shield, not to
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Animals 5 - How is the typical "posture" of a...

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