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Unformatted text preview: Coelomate Protostomes (Nemertea, Mollusks) A. Introduction 1. Include these phyla: a. Protostomates: Nemertea (ribbon worms), Mollusks (clams), Annelids (earthworms), Arthropods (crabs) b. Deuterostomates: Echinoderms (starfish) 2. Higher invertebrates- more complex organ systems 3. Coelom a. separation between outer body wall and digestive tube b. hydrostatic skeleton full of air for support c. transport organs bathed in fluids to transport nutrients d. space for organs to work 4. Terrestrial a. body covering- prevents drying out desiccation b. exoskeleton- made of chitin- used for support Ex) spiders and insects c. respiratory surface- if an animal is aquatic, then external gills- if an animal is terrestrial, then internal lungs or tracheal tube d. reproduction- fertilization can be internal or external B. Nemertea- Ribbon worms 1. Dorso/ventrally flattened but have organ systems 2. Proboscis (muscular thing used for catching prey), rhynchoceol (a modification of a coelom. 3. Tube within a tube body plan3....
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- Spring '08