''Ceyx'' ( ) is an

Old World The "Old World" () is a term for Afro-Eurasia coined by Europeans after 1493, when they became aware of the existence of the Americas. It is used to contrast the continents of Africa, Europe, and Asia in the Eastern Hemisphere, previously ...

genus of river kingfishers. These kingfishers are found from South East Asia to the

Solomon Islands Solomon Islands, also known simply as the Solomons,John Prados, ''Islands of Destiny'', Dutton Caliber, 2012, p,20 and passim is an island country consisting of six major islands and over 1000 smaller islands in Melanesia, part of Oceania, t ...

. The genus was introduced by the French naturalist

Bernard Germain de Lacépède Bernard-Germain-Étienne de La Ville-sur-Illon, comte de Lacépède or La Cépède (; 26 December 17566 October 1825) was a French natural history, naturalist and an active freemason. He is known for his contribution to the Comte de Buffon's g ...

in 1799, and derives its name from the Greek myth of

Alcyone and Ceyx In Greek mythology, Alcyone (or dubiously Halcyone) (; ) and Ceyx (; ) were a wife and husband who incurred the wrath of the god Zeus for their romantic hubris. Etymology Alkyóne comes from alkyón (), which refers to a sea-bird with a mour ...

. The

type species In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the spe ...

is the black-backed dwarf kingfisher (''Ceyx erithaca''). A

molecular phylogenetic Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to ...

study of the alcedinine kingfishers published in 2007 found that the genera as then defined did not form

monophyletic In biological cladistics for the classification of organisms, monophyly is the condition of a taxonomic grouping being a clade – that is, a grouping of organisms which meets these criteria: # the grouping contains its own most recent co ...

groups. The

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

were subsequently rearranged into four monophyletic genera. The little kingfisher,

azure kingfisher The azure kingfisher (''Ceyx azureus'') is a small kingfisher in the river kingfisher subfamily, Alcedininae.Pizzey, Graham and Doyle, Roy. (1980) ''A Field Guide to the Birds of Australia.'' Collins Publishers, Sydney. Description The azure ...

, Bismarck kingfisher, southern silvery kingfisher and Indigo-banded kingfisher were moved from ''Alcedo'' to ''Ceyx''. All except one of the birds in the reconstituted genus have three rather than the usual four toes. The exception is the Sulawesi dwarf kingfisher which retains a vestigial fourth toe. The Moluccan dwarf kingfisher (''Ceyx lepidus'') was previous named the variable dwarf kingfisher and included 15 recognised subspecies. A genetic study published in 2013 found that most of the subspecies had substantially diverged from one another. The species was therefore split and 12 of the subspecies were promoted to species status. At the same time the name was changed from the variable dwarf kingfisher to the Moluccan dwarf kingfisher. The two African species in the genus '' Ispidina'' were sometimes placed in this genus. Compared to the related species in the genus '' Alcedo'' they are more terrestrial.

Species

There are 23 species in the genus:

References

Sources

* {{DEFAULTSORT:Ceyx (Kingfisher) Alcedininae Bird genera Taxa named by Bernard Germain de Lacépède