The Coraciiformes are a group of usually colourful

bird Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweigh ...

s including the kingfishers, the bee-eaters, the

roller Roller may refer to: Birds *Roller, a bird of the family Coraciidae * Roller (pigeon), a domesticated breed or variety of pigeon Devices * Roller (agricultural tool), a non-powered tool for flattening ground * Road roller, a vehicle for compa ...

s, the

motmot The motmots or Momotidae are a family of birds in the order coraciiformes, which also includes the kingfishers, bee-eaters and rollers. All extant motmots are restricted to woodland or forests in the Neotropics, and the largest are in Middle A ...

s, and the

todies The todies are a family, Todidae, of tiny Caribbean birds in the order Coraciiformes, which also includes the kingfishers, bee-eaters and rollers. The family has one living genus, ''Todus'', and one genus known from the fossil record, '' Palaeoto ...

. They generally have syndactyly, with three forward-pointing toes (and toes 3 & 4 fused at their base), though in many kingfishers one of these is missing. The members of this order are linked by their “slamming” behaviour, thrashing their prey onto surfaces to disarm or incapacitate them. This is largely an

Old World The "Old World" is a term for Afro-Eurasia that originated in Europe , after Europeans became aware of the existence of the Americas. It is used to contrast the continents of Africa, Europe, and Asia, which were previously thought of by the ...

order Order, ORDER or Orders may refer to: * Categorization, the process in which ideas and objects are recognized, differentiated, and understood * Heterarchy, a system of organization wherein the elements have the potential to be ranked a number of d ...

, with the representation in the

New World The term ''New World'' is often used to mean the majority of Earth's Western Hemisphere, specifically the Americas."America." ''The Oxford Companion to the English Language'' (). McArthur, Tom, ed., 1992. New York: Oxford University Press, p. 3 ...

limited to the dozen or so species of

and

s, and a mere handful of the more than a hundred species of kingfishers. The name Coraciiformes means "

raven A raven is any of several larger-bodied bird species of the genus ''Corvus''. These species do not form a single taxonomic group within the genus. There is no consistent distinction between "crows" and "ravens", common names which are assigned t ...

-like". Specifically, it comes from the

Latin language Latin (, or , ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through ...

"corax", meaning "raven" and Latin "forma", meaning "form", which is the standard ending for bird orders.

Systematics

This order has been seen to be something of a mixed assortment, and the Coraciiformes may be considered as including only the rollers. All the other families would then be considered to represent lineages of birds distantly related to Coraciiformes. This seems to be oversplitting, as most Coraciiformes indeed form a reasonably robust

clade A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, ...

. Analysis of nDNA '' c-myc'' and

RAG-1 The recombination-activating genes (RAGs) encode parts of a protein complex that plays important roles in the rearrangement and recombination of the genes encoding immunoglobulin and T cell receptor molecules. There are two recombination-activ ...

exon An exon is any part of a gene that will form a part of the final mature RNA produced by that gene after introns have been removed by RNA splicing. The term ''exon'' refers to both the DNA sequence within a gene and to the corresponding sequen ...

as well as mtDNA

myoglobin Myoglobin (symbol Mb or MB) is an iron- and oxygen-binding protein found in the cardiac and skeletal muscle tissue of vertebrates in general and in almost all mammals. Myoglobin is distantly related to hemoglobin. Compared to hemoglobin, myoglobi ...

intron An intron is any nucleotide sequence within a gene that is not expressed or operative in the final RNA product. The word ''intron'' is derived from the term ''intragenic region'', i.e. a region inside a gene."The notion of the cistron .e., gene. ...

sequence In mathematics, a sequence is an enumerated collection of objects in which repetitions are allowed and order matters. Like a set, it contains members (also called ''elements'', or ''terms''). The number of elements (possibly infinite) is calle ...

data demonstrates that the Coraciiformes can be divided into a basal group that is not too distantly related to the Piciformes, and a derived

suborder Order ( la, ordo) is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between family and class. In biological classification, the order is a taxonomic rank used in the classification of organisms and ...

containing mainly kingfishers (Johansson & Ericson, 2003). The cuckoo roller's true affinities appear to lie elsewhere. The trogons and

hornbills Hornbills (Bucerotidae) are a family of bird found in tropical and subtropical Africa, Asia and Melanesia. They are characterized by a long, down-curved bill which is frequently brightly coloured and sometimes has a casque on the upper mandibl ...

are either very basal lineages, or might be considered distinct own orders; the latter are apparently slightly closer to the rollers than the former. The entire group (possibly excluding the cuckoo roller) and the Piciformes are closely related to the Passeriformes (Johansson & Ericson 2003; see also near passerine). Several extinct coraciiform families are only known from

Paleogene The Paleogene ( ; British English, also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period, geologic period and system that spans 43 million years from the end of the Cretaceous Period million yea ...

fossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...

s. They probably belong to the basal group and are sometimes difficult to assign because they were even closer still to the Piciformes (''see also'' ''

Neanis ''Neanis'' is an extinct genus of bird probably related to woodpeckers and toucans. It contains at least one species, ''N. schucherti''; ''N. kistneri'' resembles this, but it probably belongs to a distinct genus and may not be closely related. B ...

''). In addition, there are some prehistoric

genera Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclat ...

which are likewise difficult to place into a family. At least the Eocoraciidae are very basal, but the Late

Eocene The Eocene ( ) Epoch is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene' ...

(some 35 mya) Geranopteridae form a

superfamily SUPERFAMILY is a database and search platform of structural and functional annotation for all proteins and genomes. It classifies amino acid sequences into known structural domains, especially into SCOP superfamilies. Domains are functional, str ...

Coracioidea with the extant rollers and ground-rollers already (Mayr & Mourer-Chauviré 2000). A few prehistoric taxa of the present-day families have been described; see the family articles for details.

Taxonomic sequence

Unresolved * Genus '' Quasisyndactylus'' (

; Middle Eocene of Messel, Germany) - alcediniform, basal? * Genus '' Cryptornis'' (

; Late Eocene of France) – bucerotid? geranopterid? * Family Primobucconidae (

), including ''

Primobucco ''Primobucco'' is an extinct genus of bird placed in its own family, Primobucconidae. The type species, ''Primobucco mcgrewi'', lived during the Lower Eocene of North America. It was initially described by American paleo-ornithologist Pierce Br ...

'' and '' Septencoracias'' * Coraciiformes gen. et spp. indet. PQ 1216, QU 15640 (

; Late Eocene of Quercy, France: Mayr & Mourer-Chauviré 2000) * Genus '' Protornis'' (

: Oligocene of Switzerland) – basal to motmotids and meropids? A recent study suggest that the following families may belong to a separate order called Bucerotiformes. The results still in dispute though. * Family Bucorvidae (ground hornbills) * Family Bucerotidae (hornbills) * Family Upupidae (hoopoe) * Family

Phoeniculidae The wood hoopoes or scimitarbills are a small African family, Phoeniculidae, of near passerine birds. They live south of the Sahara Desert and are not migratory. While the family is now restricted to Sub-Saharan Africa, fossil evidence shows th ...

(woodhoopoes) The Leptosomidae (cuckoo roller) probably do not belong here. The trogons are sometimes placed here as a family Trogonidae. The Late Eocene Palaeospizidae are sometimes also placed in the Coraciiformes, as are the Early to Middle Eocene Primobucconidae and the Middle Eocene to Early Oligocene Sylphornithidae. The Primobucconidae at least indeed seem to belong here. Basal group * Family Eocoraciidae (

; Middle Eocene of Messel, Germany) * Family Geranopteridae (

; Late Eocene of Quercy, France – Early Miocene of Czech Republic) - includes ''"Nupharanassa" bohemica'' * Family

Coraciidae Coraciidae is a family of Old World birds, which is known as rollers because of the aerial acrobatics some of these birds perform during courtship or territorial flights. Rollers resemble crows in size and build, and share the colourful appearan ...

(rollers) * Family Brachypteraciidae (ground-rollers) * Family

Meropidae The bee-eaters are a group of non-passerine birds in the family Meropidae, containing three genera and thirty species. Most species are found in Africa and Asia, with a few in southern Europe, Australia, and New Guinea. They are characterised by ...

(bee-eaters) Suborder Alcedines * Family Todidae (todies) * Family Momotidae (motmots) * Family Alcedinidae (kingfishers)

References

*Johansson, Ulf S. & Ericson, Per G. P. (2003): Molecular support for a sister group relationship between Pici and Galbulae (Piciformes sensu Wetmore 1960). '' J. Avian Biol.'' 34(2): 185–197. PDF fulltext
*Mayr, Gerald & Mourer-Chauviré, Cécile (2000): Rollers (Aves: Coraciiformes. s.s.) from the Middle Eocene of Messel (Germany) and the Upper Eocene of the Quercy (France). '' J. Vertebr. Paleontol.'' 20(3): 533–546. DOI:10.1671/0272-4634(2000)020 533:RACSSF.0.CO;2PDF fulltext
*Terres, John K. (1980) The Audubon Society Encyclopedia of North American Birds.

External links

Order Coraciiformes - Biodiversity Overview: Untamed Science

Tree of Life: Coraciiformes
{{Authority control Extant Eocene first appearances Bird orders Eocene taxonomic orders Oligocene taxonomic orders Miocene taxonomic orders Pliocene taxonomic orders Pleistocene taxonomic orders Holocene taxonomic orders

Systematics

Taxonomic sequence

See also

References

External links