Definitionn. an extinct arthropod that was abundant in Paleozoic times
Last update: October 10, 2015
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The trilobation of the head and body - due to the expansion and flattening of the sides or "pleura" of the tegumentary skeleton - is so closely repeated in the young of Limulus that the latter has been called " the trilobite stage " of Limulus (fig. [Please select]
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These were a clear amelioration of trilobite and saurus, and a good basis for further proceeding. [Please select]
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] Between the formation of these Lower Palæozoic rocks in which the sea scorpion and trilobite ruled, and our own time, there have intervened almost immeasurable ages, represented by layers and masses of sedimentary rocks. [Please select]
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[Illustration: Trilobite] Then the first fishes made their appearance, great fierce-looking fellows like the gar pike of our lakes, but larger, and armed with scales as hard as the armour of a crocodile. [Please select]
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