Characteristics
The genus Masillaraptor is different from all other known avian taxa. It possesses a combination of characters that distinguishes it from all others.
1. The beak is almost as long as the cranium itself, with equal height over much of its length and a straight dorsal ridge. The beak curves just before its tip, restricting the nasal openings to the rear half of the beak.
2. The tibiotarsus is the longest bone in the leg.
3. On the second toe the first phalanx is shortened, whereas on the fourth toe the second and third phalanges are shortened.
4. The claws of Masillaraptor are small and weak compared to other falconiform birds with abbreviated pedal phalanges.
Characters (1) and (3) are derived within neornithine birds and also found in modern Accipitres, from which Masillaraptor is, however, distinguished in character (4).(Mayr, 2006.)
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