Onychoprion is a genus of four species of terns in the family Laridae. The genus name is from Ancient Greek onux, "claw" or "nail", and prion, "saw".[2] As a group, they have been variously called "brown-winged terns"[3] or "brown-backed terns",[4] though only one species is actually brown; the other three are dark grey or black.

Species

Although the genus Onychoprion was first described in 1832 by Johann Georg Wagler, the species in the genus were generally retained within the larger genus Sterna, the genus that holds most terns, until a study in 2005 showed that this treatment was paraphyletic, with these four species less closely related to typical Sterna terns, than several other terns long treated in other genera like Chlidonias and Larosterna.[3]

Onychoprion diverged early from other terns about 16–18 million years ago, with only the very different noddies (Anous and Gygis) diverging earlier.[5] Within the genus, Aleutian tern is the most divergent, splitting off from the rest about ten million years ago; then sooty tern diverged about seven to eight million years ago, and finally bridled and spectacled terns diverged from each other about three million years ago.[5]

Three of the four species are tropical, and one has a sub-polar breeding range. The sooty tern has a pan-tropical distribution; the bridled tern also breeds across the Tropical Atlantic and Indian Ocean but in the central Pacific it is replaced by the spectacled tern. The Aleutian tern breeds around Alaska and Siberia but winters in the tropics around South East Asia.

Genus Onychoprion – Wagler, 1832 – 4 species
Common name Scientific name and subspecies Range Size and ecology IUCN status and estimated population
Aleutian tern

Onychoprion aleuticus
(Baird, 1869)

Monotypic
 Easternmost Siberia and Western Alaska, wintering south to northeastern Australia
Map of range 		Size:

Habitat:

Diet: 		 VU 


Sooty tern

Onychoprion fuscatus
(Linnaeus, 1766)

Six subspecies
  • O. f. fuscatus (Linnaeus, 1766)
  • O. f. nubilosus (Sparrman, 1788)
  • O. f. serratus (Wagler, 1830)
  • O. f. oahuensis (Bloxam, 1826)
  • O. f. crissalis Lawrence, 1872
  • O. f. luctuosus (Philippi & Landbeck, 1866)
Pantropical seas between about 25° North and South latitude
Map of range 		Size:

Habitat:

Diet: 		 LC 


Bridled tern

Onychoprion anaethetus
(Scopoli, 1786)

Four subspecies
 Red Sea, Persian Gulf, Pacific Ocean, western Indian Ocean, Caribbean and West Africa.
Map of range 		Size:

Habitat:

Diet: 		 LC 


Spectacled tern

Onychoprion lunatus
(Peale, 1849)

Monotypic
 tropical Pacific Ocean Size:

Habitat:

Diet: 		 LC 



Cultural aspects

Manutara is the Rapa Nui language name for spectacled and sooty terns. Both arrive at Easter Island and hatch their eggs on the island called Motu Nui, an event that was used for an annual rite called Tangata manu.

References

  1. ^ "Laridae". aviansystematics.org. The Trust for Avian Systematics. Retrieved 2023-07-26.
  2. ^ Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 282. ISBN 978-1-4081-2501-4.
  3. ^ a b Bridge, E. S.; Jones, A. W. & Baker, A. J. (2005). A phylogenetic framework for the terns (Sternini) inferred from mtDNA sequences: implications for taxonomy and plumage evolution Archived 2006-07-20 at the Wayback Machine. Molecular Phylogenetics and Evolution 35: 459–469.
  4. ^ "Brown-backed Terns (Genus Onychoprion)". iNaturalist. Retrieved 2025-02-22.
  5. ^ a b Černý, David; Natale, Rossy (2022). "Comprehensive taxon sampling and vetted fossils help clarify the time tree of shorebirds (Aves, Charadriiformes)" (PDF). Molecular Phylogenetics and Evolution. 177: 107620. doi:10.1016/j.ympev.2022.107620. Retrieved 2025-02-22.
Allikas: https://en.wikipedia.org/wiki/Onychoprion
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