Jaws were now hinged and some contained teeth, which allowed for a clamping down motion on food. This also allowed for a broader diet range, can grasp, shear and chew food. Introduction. Click here to study/print these flashcards. Start studying Campbell Biology 10th Ed: Chapter 34 (The Origin and Evolution of Vertebrates. Gnathostomata definition is - a superclass or other division of Vertebrata comprising those with jaws. Le terme Agnathe (ou Agnatha du grec a, sans et gnathos, mâchoire), ou Cyclostome (ou Cyclostoma qui signifie bouche en forme de cercle), désigne l'ensemble des Crâniates dépourvus de mâchoire. Term. 02/23/2012.
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Deutersostome animals: Definition.
Level. Jaw, hox duplication (four sets), entire genome duplication, lateral line system, How did the development of jaws help these fishes? Section 2 Lecture 2. Subject.

Undergraduate 2. Cards Return to Set Details. The evolution of jaws allowed early gnathostomes to exploit food resources that were unavailable to the jawless animals. One of the most significant developments in early vertebrate evolution was the development of the jaw, which is a hinged structure attached to the cranium that allows an animal to grasp and tear its food. Description. 39. Total Cards. Biology 197 Section 2. Biology. Gnathostomes or “jaw-mouths” are vertebrates that possess jaws. Created . The 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 teeth, and jaw bones.


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