Explain briefly why the modifications of the jaws of early neopterygians (see Figure 6-5) represent an important advance in feeding, and how the further modifications seen in the jaws of teleosts (see Figure 6-6) allow still more specialization
What will be an ideal response?
Changes in the structure of the maxilla of early neopterygians allowed this bone to rotate when the mouth was opened, pointing the maxillary teeth forward and orienting them to seize prey. Still more important, folds of skin attached to the maxilla closed off the sides of the mouth, preventing prey from escaping as it was sucked inward. Teleosts added mobility to the premaxilla that allows the jaws to be protruded (extended out from the front of the head) to seize prey. Furthermore, changes in the structure of the premaxilla allow the jaws to be closed while the orobranchial chamber is still expanded, trapping prey in the mouth.
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The anatomic term for the foot is
A. pubic. B. pes. C. popliteal. D. patellar. E. acromial.
Where do the auditory tubes enter the skull?
A) stylomastoid foramen B) supra-orbital foramen C) foramen magnum D) foramen lacerum
Muscles are responsible for producing most of our body heat.?
Indicate whether the statement is true or false
After embryonic folding, the _____ sac becomes reduced in size and eventually gives rise to the first blood cells and stem cells that give rise to gametes.
Fill in the blank(s) with the appropriate word(s).