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THE RELATIONSHIPS OF THE HOATZIN |
 | | Opisthocomus agrees with the Cuculiformes and differs from the Galliformes in: 1) deep temporal fossae, 2) short mandibular proc- esses, 3) lack of basipterygoid processes, 4) lack of spina interna, 5) metasternal configuration, 6) large procoracoid, 7) spotted eggs, 8) 10 rectrices. |
 | | Opisthocomus differs from both Galliformes and Cuculiformes in: 1) lacking apteria on the sides of the neck, 2) arrangement of the adult downs, 3) number of cervical vertebrae, 4) small thoracic hae- mapophyses, 5) shape of the liver, 6) other specialized characteristics, for example, sternum, stomach, crop. |
 | | SUMMARY The systematic relationships of the Hoatzin (Opisthocomus hoazin), long classified with the Galliformes, have been re-evaluated in the light of data from electrophoretic comparisons of the egg-white proteins. |
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