English: jawed vertebrates.
Name: from Greek gnathos meamning jaw" and stoma) meaning mouth.
Species: 60000 species, 99% of all living vertebrates.
ZoologyGnathostomata have opposing jaws, teeth, paired appendages, a horizontal semicircular canal of the inner ear, myelin sheaths of neurons. The immune system is adaptive that uses V(D)J recombination to create antigen recognition sites, rather than using genetic recombination in the variable lymphocyte receptor gene.
TaxonomyNewer research suggests that a branch of
Placodermi was most likely the ancestor of present-day
Gnathostomata.
Members• †
Placodermi (armoured fish)
• Eugnathostomata
◦ †
Acanthodii (spiny sharks)
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Chondrichthyes (cartilaginous fishes via
Acanthodii)
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Osteichthyes (bony fish, ancestors of tetrapods)