BIOL 1010 Lecture Notes - Lecture 55: Symmetry In Biology, Ecdysis, Moulting
14 May 2017
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Distinguishes: 2 clades within protostomes (lophotrochozoans & edysozoans) Both have exoskeletons that must shed in order to grow. Both represent hypothesis for key events in the evolutionary history that led to animal phyla on earth The animal kingdoms great diversity arose through the process of evolution, & all animals exhibit features reminiscent of their evolutionary history. Arthropods, & molluscs & how they differ: placement. Annelids & arthropods hypothesized to be more closely related to each other than molluscs, largely based on segmented bodies. Anterior: pertaining to the front, or head, of a bilaterally symmetric animal. Posterior: pertaining the rear; or tail of a bilaterally symmetric animal. Dorsal: pertaining to the back of a bilaterally symmetric animal. Bilateral symmetry: an arrangement of body parts such that an organism can be divided through it. A bilaterally symmetric organism has mirror-image right and left sides.
