Figure 2. The jaws of the primitive fish work simply, much the way lizard jaws do. Movements of the neurocranium are not coupled with the kinematics of the upper jaw (e.g. This "four-bar linkage" has the property of allowing numerous arrangements to achieve a given mechanical result (fast jaw protrusion or a forceful bite), thus decoupling morphology from function. In cichlids generally, the oral and pharyngeal teeth differ with different species in ways that allow them to process different kinds of prey. It is referred to as the dentary bone, and forms the body of the outer surface of the jaw. Did you have an idea for improving this content? ", "Developmental and evolutionary origins of the pharyngeal apparatus", "Evolution and ecology of feeding in elasmobranchs", "Prey Capture Behavior and Feeding Mechanisms of Elasmobranchs", "An Ancient Gene Network Is Co-opted for Teeth on Old and New Jaws", "A periodic pattern generator for dental diversity", "Study of the chronologic development and eruption of teeth in elasmobranchs", "The fine structure of initial mineralisation during tooth development in the gummy shark, Mustelus manazo, Elasmobranchia", "Evolution and development of Hertwig's epithelial root sheath", "Seasonal changes in the lower jaw skeleton in male Atlantic salmon (, "Handed Foraging Behavior in Scale-Eating Cichlid Fish: Its Potential Role in Shaping Morphological Asymmetry", "Evolution of a unique predatory feeding apparatus: functional anatomy, development and a genetic locus for jaw laterality in Lake Tanganyika scale-eating cichlids", 10.1643/0045-8511(2007)7[886:ROTSLG]2.0.CO;2, "Neural crest patterning and the evolution of the jaw", "Homologies and Evolutionary Transitions in Early Vertebrate History", "Monster fish crushed opposition with strongest bite ever", "Feeding mechanics and bite force modelling of the skull of Dunkleosteus terrelli, an ancient apex predator", "Prehistoric Fish Had Most Powerful Jaws". The oral jaws are used to capture and manipulate prey by biting and crushing. Ray-finned fishes are named for their fins that are webs of skin supported by bony spines called rays.
The hyoid articulates with the mandibular arch posteriorly, but it appears to provide little support to the upper and lower jaws. Cartilaginous fishes grow multiple sets (polyphyodont) and replace teeth as they wear by moving new teeth laterally from the medial jaw surface in a conveyor-belt fashion. You should note that all these structural changes accompany, or allow, a functional change in the way the jaw works. Meckel's cartilage is a piece of cartilage from which the mandibles (lower jaws) of vertebrates evolved. Perhaps now you’d like to learn some more about fish anatomy. The inner surface of the jaw is lin… Dunkleosteous was an enormous placoderm from the Devonian period, 380–360 million years ago. In fish, both sides of the centrum are concave. The upper jaw is often formed largely from the premaxilla, with the maxilla itself located further back, and an additional bone, the symplectic, linking the jaw to the rest of the cranium.
In most species of fish, the combined bony rods rise up as a Neural Spine above the Neural Arch. The bones mentioned above extend only a small way – or in the case of most dorsal and anal fins, not at all – into the fins themselves. Vol.
Jaws probably originated in the pharyngeal arches supporting the gills of jawless fish. 1 , Jan. 1, 2013, ISSN 1600-0633 , pp. , Jaw reconstruction of the extinct Carcharodon megalodon, 1909. 217 , No.  In jawless fishes a series of gills opened behind the mouth, and these gills became supported by cartilaginous elements. ", "The origin of the vertebrate jaw: Intersection between developmental biology-based model and fossil evidence", "The opercular mouth-opening mechanism of largemouth bass functions as a 3D four-bar linkage with three degrees of freedom", "A novel classification of planar four-bar linkages and its application to the mechanical analysis of animal systems", "Evolution of Levers and Linkages in the Feeding Mechanisms of Fishes", "The Evolution of Fishes After the Devonian", "Adaptive Significance of Intra- and Interspecific Differences in the Feeding Repertoires of Cichlid Fishes", "Many-to-One Mapping of Form to Function: A General Principle in Organismal Design?
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