Evolution

Skull elements extracted from the Paris specimen, 1866
The affinities of the Mascarene parrot are unclear, and two hypotheses have competed since the mid-19th century. [12] Some authors grouped it with the
Coracopsinae (of African origin) due to its dark plumage, and others with the
Psittaculinae parrots (of Asian origin) based on the large red beak, a feature which is diagnostic for that group. [6][13] Its plumage pattern was mostly atypical for a psittaculine, though other members have black facial patterns. [2] Although little is known about most extinct parrot species of the Mascarenes, subfossil remains show that they shared common features, such as enlarged heads and jaws, reduced pectoral bones, and robust leg bones. Hume supported their common origin in the radiation of the Psittaculini
tribe based on morphological features and the fact that Psittacula parrots have managed to colonise many isolated islands in the Indian Ocean .[2]
Sea levels were lower during the
Pleistocene , so it was possible for species to colonise the Mascarene Islands from other areas. [14] The Psittaculini could have invaded the area several times, as many of the species were so specialised that they may have evolved significantly on hotspot islands before the Mascarenes emerged from the sea. [14] Réunion is 3 million years old, which is enough time for new genera to evolve, but many endemics would have been wiped out by the eruption of the
volcano Piton des Neiges between 300,000 and 180,000 years ago. Most recent and extant species would therefore probably be descendants of animals which had recolonised the island from Africa or Madagascar after this event. If the Mascarene parrot had in fact evolved into a distinct genus on Réunion prior to the volcanic eruption, it would have been one of the few survivors of this extinction event. [11]
A 2011 genetic study by Samit Kundu and colleagues (which sampled the Paris specimen) found that the Mascarene parrot was grouped among the subspecies of the lesser vasa parrot from Madagascar and nearby islands and therefore not related to the Psittacula parrots. It also found that the Mascarene parrot line diverged 4.6 to 9 million years ago, prior to the formation of Réunion, indicating this must have happened elsewhere. The cladogram accompanying the 2011 study is shown below: