Masillaraptor is an extinct genus of masillaraptorid, a group of primitive falconiforms, from the Middle Eocene Messel Pit, Germany. It is a long-legged relative of the living falcons.

Known species

Only one species of Masillaraptor is known: M. parvunguis

Etymology

Masillaraptor comes from the Latin word Masilla, which is the old name for the town of Messel, and raptor is a New Latin suffix used to indicate a predator (from rapere, to catch) and in English it means bird of prey. Specific epithet parvunguis is also Latin, coming from the word parvus which means small and feeble, while unguis means claw. The name refers to the fact that the specimen's claws are small in comparison to those of other raptors.

Characteristics

The genus Masillaraptor is different from all other known avian taxa. It possesses a combination of characters that distinguishes it from all others. 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.)

Fossil specimens

There are two specimens of Masillaraptor. Only one specimen was referenced for classification because the other is housed in an unknown private collection. Both specimens are a slab of rock containing a nearly complete, articulate but poorly preserved skeleton. The specimens are both believed to be adult members of the species. Both specimens were discovered in the Messel pit, an old shale mine known for the extremely well preserved fossils that have been discovered there.

Classification

Masillaraptor represents one of two members of Masillaraptoridae within the Falconiformes. The cladogram below displays the results of the phylogenetic analysis by Mayr & Kitchener (2022):