BIOL 1101 Lecture Notes - Lecture 11: Annelid, Circulatory System, Parthenogenesis
10 May 2016
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Document Summary
This is the most important protostome phylum, and is the iconic group the represents the ecdysozoa. The arthropoda is easily the most diverse and abundant group of animals on. The arthropoda contains a million named species (mostly insects), and there might be 50 million more arthropod species that have not yet been named. For every human being on earth, there are. 200 million arthropods alive at any one time. In the warm weather, it has been estimated that just the air over one square kilometer of temperate zone land contains 20 million arthropods. Factors which have contributed to the overwhelming success of arthropods include their exoskeletons, specialization of segments and appendages, highly developed respiratory systems, and efficient nervous and sensory systems. The first thing we notice about an arthropod is its exoskeleton, a hard but flexible outer shell composed of a waxy outer layer, lipoprotein, protein and chitin.
