Gadiformes

(vertebrate zoology) An order of actinopterygian fishes that lack fin spines and a swim bladder duct and have cycloid scales and many-rayed pelvic fins.

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A well-defined order of actinopterygian fishes, also known as the Anacanthini, which includes the codfishes and grenadiers, or rattails. Structurally the group is more or less intermediate between typical soft-rayed and spiny-rayed fishes. As in the former, there are no fin spines, the scales are cycloid, and the pelvic fin often has many rays. As in typical perciforms, however, the swim bladder has no duct, the or-bitosphenoid and mesocoracoid are absent, and the upper jaw is bordered only by the protractile premaxillae. The pelvic fins, if present, are jugular in position but are attached to the cleithra only by ligaments. See also Codfish; Perciformes.

Gadiform fishes are known from the Paleocene. Recent forms are classified into 8 families, about 185 genera, and nearly 730 species. The best-known family, the Gadidae, comprises 60 species that live in northern seas, where cod, haddock, pollock, and hake form the basis for extensive commercial fisheries. See also Actinopterygii.

Gadiformes
Greater forkbeard
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Gadiformes
Families
Bregmacerotidae (codlets) Euclichthyidae (Eucla cod) Gadidae (true cods) Lotidae(rocklings and burbot) Macrouridae (grenadiers or rattails) Melanonidae (pelagic cods) Merlucciidae (merluccid hakes) Moridae (morid cods or moras) Muraenolepididae (eel cods) Phycidae (phycid hakes)

Gadiformes is an order of ray-finned fish, also called the Anacanthini, that includes the cod and its allies. Many major food fish are in this order. They are found in marine waters throughout the world, and there are also a small number of freshwater species.

Common characteristics include the positioning of the pelvic fins (if present), below or in front of the pectoral fins. Gadiformes are physoclists, which means that the gas bladder does not have a pneumatic duct. The fins are spineless. Gadiform fish range in size from the codlets, which may be as little as 7 centimetres (2.8 in) in adult length, to the Atlantic cod, Gadus morhua, which reaches up to 2 metres (6.6 ft).^[1]

Timeline of genera

References

1. ^ Cohen, Daniel M. (1998). Paxton, J.R. & Eschmeyer, W.N.. ed. Encyclopedia of Fishes. San Diego: Academic Press. pp. 130–132. ISBN 0-12-547665-5. 

• D.M. Cohen, T. Inada, T. Iwamoto and N. Scialabba, FAO species catalogue. Vol. 10. Gadiform fishes of the world (Order Gadiformes). An annotated and illustrated catalogue of cods, hakes, grenadiers and other gadiform fishes known to date. FAO Fisheries Synopsis 10 (125) (1990)
• Sepkoski, Jack (2002). "A compendium of fossil marine animal genera". Bulletins of American Paleontology 364: p.560. http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=611&rank=class. Retrieved 2011-05-17. 

External links

• FishBase page for Gadiformes

v d e Extant Actinopterygii orders by subclass Kingdom Animalia Phylum Chordata Subphylum Vertebrata Infraphylum Gnathostomata Superclass Osteichthyes Chondrostei Polypteriformes Acipenseriformes Neopterygii Lepisosteiformes Amiiformes Osteoglossiformes Hiodontiformes Elopiformes Albuliformes Notacanthiformes Anguilliformes Saccopharyngiformes Clupeiformes Gonorynchiformes Cypriniformes Characiformes Gymnotiformes Siluriformes Salmoniformes Esociformes Osmeriformes Argentiniformes Ateleopodiformes Stomiiformes Aulopiformes Myctophiformes Lampriformes Polymixiiformes Percopsiformes Batrachoidiformes Lophiiformes Gadiformes Ophidiiformes Mugiliformes Atheriniformes Beloniformes Cetomimiformes Cyprinodontiformes Stephanoberyciformes Beryciformes Zeiformes Gasterosteiformes Syngnathiformes Synbranchiformes Tetraodontiformes Pleuronectiformes Scorpaeniformes Perciformes

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