Sensory Organs
Many trilobites had complex eyes; they also had a pair of antennae. Some trilobites were blind, probably living too deep in the sea for light to reach them. As such, they became secondarily blind in this branch of trilobite evolution. Other trilobites (e.g. Phacops rana and Erbenochile erbeni) had large eyes that were for use in more well lit, predator-filled waters.
Read more about this topic: Trilobite
Famous quotes containing the words sensory and/or organs:
“Our talk of external things, our very notion of things, is just a conceptual apparatus that helps us to foresee and control the triggerings of our sensory receptors in the light of previous triggering of our sensory receptors.”
—Willard Van Orman Quine (b. 1908)
“But the man and woman of seventy assume to know all, they have outlived their hope, they renounce aspiration, accept the actual for the necessary and talk down to the young. Let them then become organs of the Holy Ghost; let them be lovers; let them behold truth; and their eyes are uplifted, their wrinkles smoothed, they are perfumed again with hope and power.”
—Ralph Waldo Emerson (1803–1882)