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Lecture 55

BIOL 1010 Lecture 55: Lecture 55

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Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

o78P Bio 1010 Distinguishes: 2 clades within protostomes (Lophotrochozoans & Edysozoans) Lophotrochozoans – named for feeding apparatus. Includes flatworms, molluscs, & annelids. Edysozoans – include nematodes & arthropods. Both have exoskeletons that must shed in order to grow. Moulting process called Ecdysis. Both represent hypothesis for key events in the evolutionary history that led to animal phyla on earth.. Message: “The animal kingdoms great diversity arose through the process of evolution, & all animals exhibit features reminiscent of their evolutionary history.” Compare placement of Annelids, Arthropods, & Molluscs & how they differ: Morphology based tree: Annelids & Arthropods hypothesized to be more closely related to each other than molluscs, largely based on segmented bodies. Molecular based tree: Arthropods are separated from both Annelids & Molluscs & are placed in Ecdysozoans clade. TERMS TO KNOW 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 bilaterall
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