Gnathostomata

(redirected from gnathostome)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to gnathostome: superclass Gnathostomata

Gnathostomata

[‚nā·thə′stō·məd·ə]
(invertebrate zoology)
A suborder of echinoderms in the order Echinoidea characterized by a rigid, exocyclic test and a lantern or jaw apparatus.
(vertebrate zoology)
A group of the subphylum Vertebrata which possess jaws and usually have paired appendages.

Gnathostomata

 

higher vertebrates having jaws, paired nostrils, and paired limbs. The Gnathostomata include fish, amphibians, reptiles, birds, and mammals.

References in periodicals archive ?
This is not surprising since different paralogs of effector genes are deployed at different times and places among different gnathostome models, likely conferring some species-specific properties.
The data suggested that several genes were expressed in patterns analogous to those in gnathostomes (Newth, 1950; Myojin et al, 2001; Neidert et al, 2001; Meulemans and Bronner-Fraser, 2002; Meulemans et al.
Support for the forebrain in gnathostomes is provided by the paired polar bodies and anterior trabeculae.
The two structures of primary importance in the transition from agnathan (jawless) fish to gnathostomes were the mandibular arch (gill arch 2) and the hyoid arch (gill arch 3).
Other paleontologists, however, argue that gnathostomes may not have evolved that early.
He asks why, if gnathostomes existed in the Ordovician, scientists haven't found complete fossils of these animals.
When the first gnathostomes evolved during the Silurian, not only were teeth already formed, but the ability to form denticles like those found over the external surface of cartilaginous fishes had evolved and was found to extend throughout the entire oral mucosa (Kemp, 1999).
The myelinated nervous system arose in a common ancestor of all modern-day gnathostomes (jawed animals).