|
|
|
|
|
|
|
|
|
|
n |
Development
of organs of special sense in head
|
|
|
|
region to
detect prey
|
|
|
n |
Development
of a large neural circuitry (the brain)
|
|
|
|
to
integrate input and responses
|
|
|
n |
Development
of an effective feeding apparatus
|
|
|
|
(jaws:
pharyngeal arch derivatives)
|
|
|
n |
Development
of an improved respiratory
|
|
|
|
apparatus
(gills: pharyngeal arch derivatives). This
|
|
|
required the recruitment of an existing group of
|
|
|
|
cells: neural crest cells, for a new role.
|
|