Birds (Aves) from the Middle Miocene of Arrisdrift (Namibia). Preliminary study with description of two new genera: Amanuensis (Accipitriformes, Sagittariidae) and Namibiavis (Gruiformes, Idiornithidae)
Morphological characters generally intermediate between those of the genera Pelargopappus and Sagittarius, the only genera so far known in the family. Distal end less mediolaterally compressed than in Pelargopappus, but not as wide as in Sagittarius. Cranial surface, medial and lateral condyles less elongated in the proximodistal direction than in Pelargopappus, but more elongated than in Sagittarius. Cau-dal surface,
condyles relatively less projecting in the caudal direction than Pelargopappus, and much less projecting than in Sagittarius. Diaphysis proportionally more massive than in the other two genera, and tibiotarsus less elongated than in Sagittarius.
Memoir of the Geological Survey of Namibia
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