Vasa parrot

The vasa parrots that form the genus Coracopsis are four species of parrot in the Old World parrot family Psittaculidae that are endemic to Madagascar and other islands in the western Indian Ocean. Some taxonomists formerly placed the species in the genus in Mascarinus, but this is now thought to be based on the results of a heavily flawed, later-debunked genetic study.[1]

The name vasa parrot is also used for the greater vasa parrot.

Vasa parrot
Lesser vasa parrot
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Class: Aves
Order: Psittaciformes
Family: Psittaculidae
Subfamily: Psittrichasinae
Genus: Coracopsis
Wagler, 1832
Type species
Psittacus niger (lesser vasa parrot)
Linnaeus, 1758
Species

Taxonomy

The genus Coracopsis was introduced in 1832 by the German ornithologist Johann Georg Wagler.[2] The type species was designated as the lesser vasa parrot by George Robert Gray in 1840.[3][4]

Species

The genus contains four species:[5]

  • Coracopsis vasa, (Shaw) 1812 – (greater vasa parrot)
    • Coracopsis vasa comorensis, (Peters,W) 1854
    • Coracopsis vasa drouhardi, Lavauden 1929
    • Coracopsis vasa vasa, (Shaw) 1812
  • Coracopsis nigra, (Linnaeus) 1758 – (lesser vasa parrot also known as black parrot)
    • Coracopsis nigra libs, Bangs 1927
    • Coracopsis nigra nigra, (Linnaeus) 1758
  • Coracopsis sibilans, Milne-Edwards & Oustalet 1885 (Comoros black parrot)[6] (split from Coracopsis nigra)
  • Coracopsis barklyi, Newton 1867 – (Seychelles black parrot)

Phylogeny

A 2011 genetic study found the Mascarene parrot from Réunion to be nested 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.[7] The cladogram accompanying the study is shown below:

E

Coracopsis vasa drouhardii (W Madagascar)

Coracopsis vasa vasa (E Madagascar)

Coracopsis nigra barklyi (Praslin Island (Seychelles))

Mascarinus mascarinus (Reunion (Mascarenes))

Coracopsis nigra siblans (Comoros)

Coracopsis nigra nigra (E Madagascar)

Coracopsis nigra libs (W Madagascar)

Another group of scientists later acknowledged the finding, but pointed out that the sample might have been damaged, and that further testing was needed before the issue could be fully resolved. They also noted that if Mascarinus was confirmed to be embedded within the genus Coracopsis, the latter would become a junior synonym, since the former name is older.[8] Hume has expressed surprise by these findings, due to the anatomical similarities between the Mascarene parrot and other parrots from the islands that are believed to be psittaculines.[9] However, a later study found that the placement of Mascarinus within Coracopsis was likely a result of cross-contamination of genetic material during the study, debunking this placement, and supporting them as being two distinct, unrelated genera within different subfamilies.[10]

Description

They are notable in the parrot world for their peculiar appearance, which includes extremely truncated bodies with long necks, black to grey feathers and a pink beak.

The skin of both female and male vasas turns yellow during the breeding season, and there is often feather loss. However, in females the feather loss can result in complete baldness. Another interesting feature of the females breeding physiology is when her feathers, which are usually black to grey, turn brown without a moult. This is caused by the redistribution of melanin, which is the pigment that makes the vasas' feathers black.

Unusual characteristics

In addition to their appearance they possess aspects of their physiology that make them unique amongst parrots. Vasa chicks are known to hatch after only 18–20 days of incubation, which is highly irregular as parrots of the vasa size range tend to take up to 30 days to hatch.

The male vasas' cloaca is able to invert into a hemipenis, which becomes erect during mating – a feature unique to the genus. This phallus is associated with prolonged matings enforced by a copulatory tie.[11] Baby vasas possess pads on their beaks which when stimulated prompt a strong feeding response. These pads disappear after only a few weeks, however the feeding or 'weaning' reflex remains unusually strong well into adulthood. Often aviculturalists have to use a syringe to force food into the crops of young vasas as the intensity of the weaning reflex prevents them from being spoon fed.

Vasa parrots infected with the debilitating psittacine beak and feather disease are known to turn white, which, during the 1970s when the first wave of birds were exported into Europe and America, resulted in them being mistakenly advertised by importers as albinos.

References
Wikimedia Commons has media related to Coracopsis.
  • Kundu, S., C.G. Jones, R.P. Prys-Jones, and J.J. Groombridge. 2012. The evolution of the Indian Ocean parrots (Psittaciformes): extinction, adaptive radiation and eustacy. Molecular Phylogenetics and Evolution 62: 296–305.
  1. Podsiadlowski, Lars; Gamauf, Anita; Töpfer, Till (February 2017). "Revising the phylogenetic position of the extinct Mascarene Parrot Mascarinus mascarin (Linnaeus 1771) (Aves: Psittaciformes: Psittacidae)". Molecular Phylogenetics and Evolution. 107: 499–502. doi:10.1016/j.ympev.2016.12.022. ISSN 1095-9513. PMID 28017858.
  2. Wagler, Johann Georg (1832). "Monographia Psittacorum". Abhandlungen der mathematisch-physikalischen Classe, Königlich-Bayerische Akademie der Wissenschaften. 1: 463–750 [501].
  3. Gray, George Robert (1840). A List of the Genera of Birds : with an Indication of the Typical Species of Each Genus. London: R. and J.E. Taylor. p. 50.
  4. Peters, James Lee, ed. (1937). Check-List of Birds of the World. Vol. 3. Cambridge, Massachusetts: Harvard University Press. p. 229.
  5. Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (July 2021). "Parrots, cockatoos". IOC World Bird List Version 11.2. International Ornithologists' Union. Retrieved 3 September 2021.
  6. "Comoro Parrot (Coracopsis sibilans) - BirdLife species factsheet". Archived from the original on 2015-01-29.
  7. Kundu, S.; Jones, C. G.; Prys-Jones, R. P.; Groombridge, J. J. (2011). "The evolution of the Indian Ocean parrots (Psittaciformes): Extinction, adaptive radiation and eustacy". Molecular Phylogenetics and Evolution. 62 (1): 296–305. doi:10.1016/j.ympev.2011.09.025. PMID 22019932.
  8. Joseph, L.; Toon, A.; Schirtzinger, E. E.; Wright, T. F.; Schodde, R. (2012). "A revised nomenclature and classification for family-group taxa of parrots (Psittaciformes)". Zootaxa. 3205. 3205: 26–40. doi:10.11646/zootaxa.3205.1.2.
  9. Hume, J. P.; Walters, M. (2012). Extinct Birds. London: A & C Black. pp. 177–178. ISBN 978-1-4081-5725-1.
  10. Podsiadlowski, Lars; Gamauf, Anita; Töpfer, Till (February 2017). "Revising the phylogenetic position of the extinct Mascarene Parrot Mascarinus mascarin (Linnaeus 1771) (Aves: Psittaciformes: Psittacidae)". Molecular Phylogenetics and Evolution. 107: 499–502. doi:10.1016/j.ympev.2016.12.022. ISSN 1095-9513. PMID 28017858.
  11. Ekstrom, J. M. M.; Burke, T.; Randrianaina, L.; Birkhead, T. R. (2007-01-22). "Unusual sex roles in a highly promiscuous parrot: the Greater Vasa Parrot Caracopsis vasa". Ibis. Wiley. 149 (2): 313–320. doi:10.1111/j.1474-919X.2006.00632.x.
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