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| 1. Well-developed pectoral girdle, free from skull |
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| Discrete humerus; prominent scapula |
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| 2. Differentiated tarsals, carpels and phalanges |
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| 3. Sacrum |
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| 4. Cheek plate with seven or fewer bones |
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| 5. Stapes and tympanum (later than Ichthyostega) |
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