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Fossil of Chondrosteus acipenseroides from Lyme Regis Strongylosteus hindenburgi fossil from Posidonia Shale, Staatliches Museum für Naturkunde Stuttgart. Chondrosteidae / ˌ k ɒ n d r oʊ s t i ˈ aɪ d iː / is a family of extinct marine actinopterygian fishes, known from the Early Jurassic of Europe.
Actinopterygii (/ ˌ æ k t ɪ n ɒ p t ə ˈ r ɪ dʒ i aɪ /; from Ancient Greek ἀκτίς (aktis) 'having rays' and πτέρυξ (ptérux) 'wing, fins'), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish [2] that comprise over 50% of living vertebrate species. [3]
Acanthopterygii (meaning "spiny finned one") is a superorder of bony fishes in the class Actinopterygii.Members of this superorder are sometimes called ray-finned fishes for the characteristic sharp, bony rays in their fins; however this name is often given to the class Actinopterygii as a whole.
The winners of the 2024 European Wildlife Photographer of the Year awards have been announced. Launched in 2001, this competition is one of the most prestigious in modern nature photography. This ...
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Near et al. (2012) explored the phylogeny and divergence times of every major lineage, analysing the DNA sequences of 9 unlinked genes. Near et al. also calibrated (set actual values for) branching times in this tree from 36 reliable measurements of absolute time from the fossil record.
The notochord, usually only found in fish embryos, is unconstricted and retained throughout life. [6] The premaxilla and maxilla bones of the skull present in other vertebrates have been lost. While larvae and early juvenile acipenseriforms have teeth, the adults are toothless, or nearly so.
Chondrostei is a group of non-neopterygian ray-finned fish.While the term originally referred to the paraphyletic grouping of all non-neopterygian ray-finned fish, it was redefined by Patterson in 1982 to be a clade comprising the Acipenseriformes (which includes sturgeon and paddlefish) and their extinct relatives.
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