BIOL 1101 Lecture Notes - Lecture 10: Herbivore, Isopoda, Armadillidiidae
10 May 2016
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Document Summary
There are so many classes of arthropods that they are divided into subphyla. This lesson deals with the trilobitomorpha, chelicerata, and crustacea. The next module will deal with the myriapoda and hexapoda. As far as we know, the trilobites are the earliest arthropods. They all died out 250 million years ago in the great permian mass extinction, yet we know a good deal about them because we have fossils of nearly. The picture shows an excellent cast of a trilobite that dr. k. keeps on his desk as a conversation piece. Unfortunately, no one has ever asked about it! Trilobites ranged in size from 0. 5 mm to 70 centimeters in length. They were flattened, oval creatures divided into a number of segments with appendages. They had well-developed heads which bore antennae and compound eyes. However, trilobites showed little specialization of their segments.
