Citizendia
Your Ad Here

Perciformes
Yellow perch (Perca flavescens)
Yellow perch (Perca flavescens)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Families

many, see text

The Perciformes, also called the Percomorphi or Acanthopteri, include about 40% of all bony fish and are the largest order of vertebrates. The yellow perch ( Perca flavescens) is a species of Perch found in the United States and Canada, where it is often referred to by the shortform Chordates ( Phylum Chordata) are a group of Animals that includes the Vertebrates together with several closely related Invertebrates The Actinopterygii (the plural form of Actinopterygius) comprise the class of the ray-finned fishes. In Biological classification, family ( Latin Fish are aquatic Vertebrate animals that are typically ectothermic (previously Cold-blooded) covered with scales, and equipped with two Vertebrates are members of the Subphylum Vertebrata, Chordates with backbones or spinal columns The grouping sometimes includes The name Perciformes means perch-like. Perca is the genus of fish referred to as perch or sometimes yellow perch, a group of freshwater Fish belonging to the family Percidae They belong to the ray-finned fish and comprise over 7000 different species, with varying shapes and sizes, found in almost all aquatic environments. The Actinopterygii (the plural form of Actinopterygius) comprise the class of the ray-finned fishes. They are also the most variably sized order of vertebrates, ranging from the 7mm (0. 3 in) Schindleria brevipinguis to the 5m (16. Schindleria brevipinguis is a Species of marine Fish in family Schindleriidae of Perciformes. 5 ft) large Makaira species, at about 10 billion times heavier. Makaira ( Latin via Greek: "sword" is a Genus of Marlins and Spearfishes It includes the black, They first appeared and diversified in the Late Cretaceous. The Cretaceous (kriːˈteɪʃəs, usually abbreviated 'K' for its German translation "Kreide" is a geologic period and system, reaching from the end of Perciform fish typically have dorsal and anal fins divided into anterior spiny and posterior soft-rayed portions, which may be partially or completely separated. The Anatomy of Fish is primarily governed by the physical characteristics of Water, which is much denser than air holds a relatively small amount of dissolved The Anatomy of Fish is primarily governed by the physical characteristics of Water, which is much denser than air holds a relatively small amount of dissolved Ichthyology uses several terms that are unique to the science There are usually pelvic fins with one spine and up to five soft rays, either positioned by the throat or under the belly. The Anatomy of Fish is primarily governed by the physical characteristics of Water, which is much denser than air holds a relatively small amount of dissolved Scales are usually ctenoid in form, though sometimes they are cycloid or otherwise modified. Ichthyology uses several terms that are unique to the science Ichthyology uses several terms that are unique to the science Various other, more technical characters define the group.

Classification is controversial. As traditionally defined the Perciformes are almost certainly paraphyletic. In Phylogenetics, a group of organisms is said to be paraphyletic if the group contains its most recent common ancestor but does not contain all Other orders that should possibly be included as suborders are the Scorpaeniformes, Tetraodontiformes, and Pleuronectiformes. Scorpaeniformes is an order of ray-finned fish, but it has also been called the Scleroparei. The Tetraodontiformes are an order of highly derived ray-finned fish, also called the Plectognathi. The flatfish are an order ( Pleuronectiformes) of Ray-finned fish, also called the Heterosomata sometimes classified as a suborder of Perciformes Of the presently recognized suborders several may be paraphyletic as well.

Families

These are grouped by suborder/superfamily, generally following Fishes of the World. Fishes of the World by Joseph S Nelson is a standard reference for Fish Systematics.

References

© 2009 citizendia.org; parts available under the terms of GNU Free Documentation License, from http://en.wikipedia.org
 Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic