Collocalia
| Collocalia | ||||||||||
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Salangans ( Collocalia esculenta ). (From Meyers Konversations-Lexikon (1885–90)) |
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| Scientific name | ||||||||||
| Collocalia | ||||||||||
| GR Gray , 1840 |
Collocalia is a genus of birdsinthe sailor family (Apodidae). Originally all of the almost 30 species of salangans were assigned to this genus, which is still seen today by some authors. RK Brooke divided the Salangans into three genera in 1970. In the genus Collocalia only three species remained, namely very small sailors with shiny plumage, which, with the exception of the dwarf alangans, do not have the ability to echo .
features
With a body length between nine and ten centimeters, the representatives of the genus Collocalia are very small sailors, the dwarf salangan ( Collocalia troglodytes ) is the smallest salangan species. What all species have in common is the sheen of the plumage, whereby the intensity shows both geographical variations and decreases when the plumage is worn. The pattern on the underside of the birds is characteristic: the underside is white except for the lower cover feathers of the tail and the dark throat, which partially continues into the upper chest area.
Systematics
The division of the salangans made by RK Brooke in 1970 was essentially based on the ability to echolocate . The Aerodramus species have this ability, Brooks implied that the Collocalia species do not. In 2004, it was clearly demonstrated that the genus Collocalia scoring Zwergsalangane ( C. troglodytes ) has the ability to echolocation. This property has lost its outstanding importance for differentiating between the genera Aerodramus and Collocalia . In 2005, a group of researchers led by Henri Thomassen suspected that echolocation in the dwarf alangana was caused by convergent evolution . Although the monophyly of Aerodramus and Collocalia was also confirmed in these investigations, the authors considered reuniting all salangans in one genus, as there is no longer any clear external characteristic to differentiate them.
The following species are included in the genus:
- Salangans ( Collocalia esculenta )
- Linchisalangane ( Collocalia linchi )
- Dwarf Salangans ( Collocalia troglodytes )
literature
- Phil Chantler, Gerald Driessens: A Guide to the Swifts and Tree Swifts of the World . Pica Press, Mountfield 2000, ISBN 1-873403-83-6
Individual evidence
- ^ Henri A. Thomassen, Robert-Jan den Tex, Merijn AG de Bakker, G. David E. Povel: Phylogenetic relationships amongst swifts and swiftlets: A multi locus approach. In: Molecular Phylogenetics and Evolution. 37, 2005, pp. 264-277, doi : 10.1016 / j.ympev.2005.05.010 .
Web links
- Collocalia on the IUCN Red List of Threatened Species.