Gruiformes

"Grui" redirects here. For other uses, see Grui (disambiguation).
Gruiformes
Temporal range:
Late Cretaceous – Holocene, 66–0 Ma
Crested crane, Balearica regulorum
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Class: Aves
Clade: Gruimorphae
Order: Gruiformes
Bonaparte, 1854
Families

Some 5-10 living, see article text.

Global distribution of the cranes and allies.

The Gruiformes are an order containing a considerable number of living and extinct bird families, with a widespread geographical diversity. Gruiform means "crane-like".

Traditionally, a number of wading and terrestrial bird families that did not seem to belong to any other order were classified together as Gruiformes. These include 14 species of large cranes, about 145 species of smaller crakes and rails, as well as a variety of families comprising one to three species, such as the Heliornithidae, the limpkin, or the trumpeters. Other birds have been placed in this order more out of necessity to place them somewhere; this has caused the expanded Gruiformes to lack distinctive apomorphies. Recent studies indicate that these "odd Gruiformes" are if at all only loosely related to the cranes, rails, and relatives ("core Gruiformes").

Systematics

There are only two suprafamilial clades (natural groups) among the birds traditionally classified as Gruiformes. Rails (Rallidae), flufftails (Sarothruridae), finfoots and sungrebe (Heliornithidae), adzebills (Aptornithidae), trumpeters (Psophiidae), limpkin (Aramidae), and cranes (Gruidae) compose the suborder Grues and are termed "core-Gruiformes" (Fain et al. 2007). These are the only true Gruiformes. The suborder Eurypygae includes the kagu (Rhynochetidae) and sunbittern (Eurypygidae). These are not even remotely related to Grues. The families of mesites or roatelos (Mesitornithidae), button-quails (Turnicidae), Australian plains-wanderer (Pedionomidae), seriemas (Cariamidae), and bustards (Otididae) each represent distinct and unrelated lineages. Many families known only from fossils have been assigned to the Gruiformes, e.g., Ergilornithidae, Phorusrhacidae, Messelornithidae, Eogruidae, Idiornithidae, Bathornithidae, to name just a few (see below). Though some of these are superficially 'crane-like' and the possibility that some may even be related to extant families traditionally included in the Gruiformes, there are no completely extinct families that can be confidently assigned to core-Gruiformes.

The traditional order Gruiformes was established by the influential German avian comparative anatomist Max Fürbringer (1888). Over the decades, many ornithologists suggested that members of the order were in fact more closely related to other groups (reviewed by Olson 1985, Sibley and Ahlquist 1990). For example, it was thought that sunbittern might be related to herons and that seriemas might be related to cuckoos. Olson and Steadman (1981) were first to correctly disband any of the traditional Gruiformes. They recognized that the Australian plains-wanderer (family Pedionomidae) was actually a member of the shorebirds (order Charadriiformes) based on skeletal characters. This was confirmed by Sibley and Ahlquist (1990) based on DNA-DNA hybridization and subsequently by Paton et al. (2003), Paton and Baker (2006) and Fain and Houde (2004, 2006). Sibley and Ahlquist furthermore removed button-quails (Turnicidae) from the Gruifomes based on large DNA-DNA hybridization distances to other supposed Gruiformes. However, it was not until the work of Paton et al. (2004) and Fain and Houde (2004, 2006) that the correct placement of buttonquails within the shorebirds (order Charadriiformes) was documented on the basis of phylogenetic analysis of multiple genetic loci. Using 12S ribosomal DNA sequences, Houde et al. (1997) were the first to present molecular genetic evidence of gruiform polyphyly, although apparently they were not convinced by it. However, on the basis of numerous additional sequence data, it has been shown decisively that the traditionally recognized Gruiformes consist of five to seven unrelated clades (Fain and Houde 2004, Ericson et al. 2006, Hackett et al. 2008).

Fain and Houde (2004) proposed that Neoaves are divisible into two clades, Metaves and Coronaves, although it has been suggested from the start that Metaves maybe paraphyletic (Fain and Houde 2004, Ericson et al. 2006, Hackett et al. 2008). Sunbittern, kagu, and mesites all group within Metaves but all the other lineages of "Gruiformes" group either with a collection of waterbirds or landbirds within Coronaves. This division has been upheld by the combined analysis of as many as 30 independent loci (Ericson et al. 2006, Hackett et al. 2008), but is dependent on the inclusion of one or two specific loci in the analyses. One locus, i.e., mitochondrial DNA, contradicts the strict monophyly of Coronaves (Morgan-Richards et al. 2008), but phylogeny reconstruction based on mitochondrial DNA is complicated by the fact that few families have been studied, the sequences are heavily saturated (with back mutations) at deep levels of divergence, and they are plagued by strong base composition bias.

The kagu and sunbittern are one another's closest relatives. It had been proposed (Cracraft 2001) that they and the recently extinct adzebills (family Aptornithidae) from New Zealand constitute a distinct Gondwanan lineage. However, sunbittern and kagu are believed to have diverged from one another long after the break-up of Gondwanaland and the adzebills are in fact members of the Grues (Houde et al. 1997, Houde 2009). The seriemas and bustards represent distinct lineages within neoavian waterbirds.

Rails are one of the most widespread Gruiformes

Phylogeny

Rallidae based on the work by John Boyd.[1]
Grui
Psophiidae

Psophia
Aramidae

Aramus


Gruidae

Balearica

Grus





Ralli

Heliornithidae

Heliopais

Podica



Heliornis




Sarothruridae

Rallicula

Canirallus

Sarothrura




Rallidae

?Rougetius


Rallinae

Anurolimnas

?Biensis

Rallus


?Gymnocrex

Gallirallus

?†Aphanapteryx

?†Erythromachus

Dryolimnas

Crex

Lewinia
Gallinulinae
Pardirallini


Pardirallus

Mustelirallus

Amaurolimnas

Aramides




Gallinulini

?Pareudiastes


Tribonyx

Porzana

Paragallinula

Gallinula

Fulica







Porphyrioninae
Porphyrionini

†Aphanocrex

Porphyrio
Himantornithini


Himantornis

Megacrex


Aenigmatolimnas

Poliolimnas

Gallicrex

Amaurornis
Zaporniini

Rallina

Zapornia



Laterallinae


Micropygia

Rufirallus

Laterallus


?Mundia

Creciscus

Coturnicops

Hapalocrex

Limnocrex














ORDER GRUIFORMES[2][3]

When considered to be monophyletic, it was assumed that Gruiformes was among the more ancient of avian lineages. The divergence of "gruiforms" among "Metaves" and "Coronaves" is proposed to be the first divergence among Neoaves, far predating the Cretaceous–Paleogene extinction event c. 66 mya(Houde 2009). No unequivocal basal gruiforms are known from the fossil record. However, there are several genera that are not unequivocally assignable to the known families and that may occupy a more basal position:

Other even more enigmatic fossil birds and five living families are occasionally suggested to belong into this order, such as the proposed Late Cretaceous family Laornithidae and the following taxa:

See also

References

  1. ↑ John Boyd's website Boyd, John (2007). "GRUAE I- Opisthocomiformes & Gruiformes". Retrieved 30 December 2015.
  2. ↑ Mikko's Phylogeny Archive Haaramo, Mikko (2007). "Gruiformes – cranes, rails, and relatives". Retrieved 30 December 2015.
  3. ↑ Paleofile.com (net, info) . "Taxonomic lists- Aves". Retrieved 30 December 2015.
  4. ↑ Gerald Mayr (2016). "On the taxonomy and osteology of the Early Eocene North American Geranoididae (Aves, Gruoidea)". Swiss Journal of Palaeontology. in press. doi:10.1007/s13358-016-0117-2.
  5. 1 2 Frank Gill and Minturn Wright: Birds of the World Recommended English Names. Princeton University Press, 2006, ISBN 0-7136-7904-2
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