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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]
Cladistia is a clade of bony fishes whose only living members are the bichirs of tropical Africa. [1] Their major synapomorphies are a heterocercal tail in which the dorsal fin has independent rays, and a posteriorly elongated parasphenoid.
The exact position in the phylogenetic tree is debated. Andreolepis has been considered a primitive actinopterygian, partly based on scale characteristics and the presence of ganoine , a homologue to true enamel , [ 8 ] which was thought to be limited to actinopterygians whereas true enamel is limited to sarcopterygians.
Euteleostei, whose members are known as euteleosts, is a clade of bony fishes within Teleostei that evolved some 240 million years ago, although the oldest known fossil remains are only from the Early Cretaceous. [1]
3. Characteristics/qualities of a large mammal. 4. These words are related to a particular genre of music (hint: they deal with "names" that are spelled a little differently).
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.
[2] [3] [4] They are the second earliest diverging group of living ray-finned fish after the bichirs. Despite being early diverging, they are highly derived , having only weakly ossified skeletons that are mostly made of cartilage , and in modern representatives highly modified skulls.
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