Term
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Definition
| system of supports surrounding pharynx. 4 paired elements (pharyngo-, epi-, cerato-, hypobranchial); single median element (basibranchial) |
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Term
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Definition
| support of gills, associated w/ visceral arches |
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Term
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Definition
| anterior most visceral arch, first arch; upper elements palatoquadrate; lower elements Meckel's cartilage |
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Term
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Definition
| second visceral arch; braces jaws; hyomandibular is upper element; ceratohyal is lower paired element; spiracle is remnant of gill slit in cartilaginous fishes, b/w hyoid and mandibular arch; hyoid arch, not jaws, primitively supported gill tissue |
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Term
| remaining visceral arches |
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Definition
| support gills: gill arches, branchial arches |
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Term
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Definition
| not homologous to branchial basket of lampreys |
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Term
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Definition
| arose from modification of anterior most visceral arches in jawless fishes; application of this to jaws not well supported in fossil record, but no other alternate model |
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Term
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Definition
| structure thats repeated in diff segments, and modified in each segment for diff functions |
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Term
| anterior post arches for? |
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Definition
| modified for prey capture, modified first for respiratory pumping of water |
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Term
| evolutionary advantages of jaws |
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Definition
| greater diet breadth, greater efficiency |
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