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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]
Esocidae is a family of ray-finned fish in the order Salmoniformes, which contains pike, pickerel, and mudminnows. [1] While the family traditionally only contained the genus Esox, recent genetic and paleontological research have recovered Novumbra and Dallia as members of the family Esocidae, being closer related to Esox than Umbra.
[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.
The jaws have a narrow band of thin teeth. The dorsal fin contains 12–13 spines and a similar number of soft rays while the anal fin has 3 spines and 12–13 soft rays, the second spine is slightly thicker and longer than the third. The entire body is covered in scales apart from the tip of the snout, lips and chin. [3]
Agnatha (/ ˈ æ ɡ n ə θ ə, æ ɡ ˈ n eɪ θ ə /; [3] from Ancient Greek ἀ-(a-) 'without' and γνάθος (gnáthos) 'jaws') is a paraphyletic infraphylum [4] of non-gnathostome vertebrates, or jawless fish, in the phylum Chordata, subphylum Vertebrata, consisting of both living (cyclostomes) and extinct (conodonts, anaspids, and ostracoderms, among others).
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Perciformes Temporal range: Early Paleocene–recent PreꞒ Ꞓ O S D C P T J K Pg N Dusky grouper (Epinephelus marginatus) Scientific classification Domain: Eukaryota Kingdom: Animalia Phylum: Chordata Class: Actinopterygii Clade: Percomorpha Order: Perciformes Bleeker, 1863 Type species Perca fluviatilis Linnaeus, 1758 Suborders See text Perciformes, also called the Acanthopteri, is an order ...
WEST PALM BEACH, Florida/ROME (Reuters) -Italian Prime Minister Giorgia Meloni said on Sunday she was ready to work with Donald Trump after making a surprise visit to Florida to meet the president ...
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