Gasterosteiformes

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Gasterosteiformes is an order of ray-finned fishes that includes the sticklebacks and relatives.

In the Gasterosteiformes, the pelvic girdle is never attached to the cleithra directly, and the supramaxillary, orbitosphenoid, and basisphenoid bones are absent. The body is often partly or completely covered with dermal plates.

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Three-spined stickleback

phylum Chordata The three-spined stickleback is a fish native to most inland coastal waters north of 30°N. It has long been a subject of scientific study for many reasons. It shows great morphological variation throughout its range, ideal for questions about evolution and population genetics. Most populations are anadromous (they live in seawater but breed in freshwater or brackish water) and very tolerant of changes in salinity, a subject of interest to physiologists

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class Actinopterygii
order Gasterosteiformes
family Gasterosteidae
genus Gasterosteus
species G. aculeatus