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Protostomes Lab - Protostomes Protostomes-first opening in...

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Protostomes Protostomes-first opening in embryo becomes mouth in adult; phylum Arthropoda and lower Schizocoelomate-how body cavity develops in protostomes Deuterostomes-first opening in embryo becomes anus; phylum Echinodermata and higher Enterocoelomate-how body cavity develops in deuterostomes Triploblastic-three distinct layers of cells, usually in late gastrula stage Ectoderm-outer covering and nervous Endoderm-lining of digestive system Mesoderm-muscles, skeleton,connective tissue, reproductive tissue, etc… Coelom-body cavity Bilaterally symmetrical animals-tube within a tube body plan I. Clade lophotrochozoa a. Phylum annelida i. Characteristics 1. segmented worms 2. closed circulatory system 3. tubular body ii. Classes 1. Class Oligochaeta a. Few bristles b. Hermaphroditic-male and female reproductive organs in one organism c. Setae-bristles; locomotion d. Earthworms (dissection, slide ) 2. Class Polychaeta a. Many bristles b. Marine worms c. Freshwater, marine, terrestrial 3. Class Hirudinea a.
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