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See all on WikipediaGnathostomata are the jawed vertebrates. Gnathostome diversity comprises roughly 60,000 species, which accounts for 99% of all living vertebrates, including humans. In addition to opposing jaws, living gnathostomes have true teeth (a characteristic which has subsequently been lost in some), paired appendages (pectoral … See more
The appearance of the early vertebrate jaw has been described as "a crucial innovation" and "perhaps the most profound and radical evolutionary step in the vertebrate history". Fish without jaws had more difficulty … See more
Wikipedia text under CC-BY-SA license Palaeospondylus and the early evolution of gnathostomes | Nature
WEBAug 23, 2023 · Bayesian tip-dated phylogeny of 99 early gnathostomes based on the revised matrix presented in this study, showing the position of †P. gunni (bolded) within Gnathostomata but outside Osteichthyes.
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WEBThe Gnathostomata, or gnathostomes, are the majority of the Middle Devonian (-380 million years ago) to Recent vertebrates. They differ from all other craniates or vertebrates in having a vertically biting device, the jaws, which consist of an endoskeletal mandibular arch and a variety of exoskeletal grasping, crushing, or shearing organs, i.e ...
The oldest gnathostome teeth | Nature
WEBSep 28, 2022 · The fossil record currently points to the latter part of the Silurian period 4, 5, 6, 7 (around 425 million years ago) as a minimum date for the appearance of gnathostome teeth and to the ...
Gnathostomata - Simple English Wikipedia, the free encyclopedia
WEBGnathostomata is the group of vertebrates with jaws. The group was meant to include all jawed fish, but in modern fashion it also includes all the tetrapods as well, since they evolved from jawed fish. It is the sister group of the Agnatha, the jawless vertebrates.
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Gnathostomata - Wikiwand
WEBGnathostomata ( / ˌnæθoʊˈstɒmətə /; from Ancient Greek: γνάθος ( gnathos) 'jaw' + στόμα ( stoma) 'mouth') are the jawed vertebrates. Gnathostome diversity comprises roughly 60,000 species, which accounts for 99% of all living vertebrates, including humans.
WEBMay 23, 2018 · Gnathostomata. Gnathostomata A subphylum or superclass of chordates consisting of all vertebrates that possess jaws. It contains six extant classes: Chondrichthyes (cartilaginous fishes), Osteichthyes (bony fishes), Amphibia, Reptilia, Aves (birds), and Mammalia. Compare Agnatha.
Gnathostome | vertebrate | Britannica
WEB…advanced vertebrates with jaws (Gnathostomata) has involved both the appearance of new hormones and the further evolution of some of those already present in agnathans; in addition, extensive specialization of target organs …
Palaeospondylus and the early evolution of gnathostomes - Nature
WEBGnathostomata crownward of this clade, as well as Osteichthyes, Sarcopterygii and Tetrapodomorpha were all supported by moderate to high posterior values. The time-calibrated phylogeny
WEBSep 20, 2016 · They have an excellent fossil record because their dermal bones were generally robust and easily preserved. Placoderms are of great significance as a model for the ancestral gnathostome condition. The …
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