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Chondrichthyes (/ k ɒ n ˈ d r ɪ k θ i iː z /; from Ancient Greek χόνδρος (khóndros) 'cartilage' and ἰχθύς (ikhthús) 'fish') is a class of jawed fish that contains the cartilaginous fish or chondrichthyans, which all have skeletons primarily composed of cartilage.
Myomere counts are sometimes used for identifying specimens, since their number corresponds to the number of vertebrae in the adults. Location varies, with some species containing these only near the tails, while some have them located near the scapular or pelvic girdles.
St. Johns or Saint Johns [1] is the largest city and county seat of Clinton County in the U.S. state of Michigan. [4] The population was 7,698 at the 2020 census.. St. Johns is located in the north of Clinton County, surrounded by Bingham Township (although the two are administered independently).
Fish use fins to propel and stabilise themselves in the water. Over 33,000 species of fish have been described as of 2017, [ 1 ] of which about 20,000 are marine fish. [ 2 ]
Fish anatomy is the study of the form or morphology of fish. It can be contrasted with fish physiology , which is the study of how the component parts of fish function together in the living fish. [ 1 ]
Icefish are typically ambush predators; thus, they can survive long periods between feeding, and often consume fish up to 50% of their own body length at one time. Maximum body lengths of 25–50 cm (9.8–19.7 in) have been recorded in these species.
Fish bone is any bony tissue in a fish, although in common usage the term refers specifically to delicate parts of the non-vertebral skeleton of such as ribs, fin spines and intramuscular bones. Not all fish have fish bones in this sense; for instance, eels and anglerfish do not possess bones other than the cranium and the vertebrae.
Osteichthyes (bone-fish) or bony fishes are a taxonomic group of fish that have bone, as opposed to cartilaginous skeletons. The vast majority of fish are osteichthyans, which is an extremely diverse and abundant group consisting of 45 orders, with over 435 families and 28,000 species. [21] It is the largest class of vertebrates in existence today.
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