Chapter 34_study aides - Chapter 34 Coelomate Invertebrates...

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Chapter 34: Coelomate Invertebrates study aide 1. Coelomate body design a. Repositions body’s fluid b. Allows complex tissues/organs to develop c. Allows for a larger body size 2. Phylum Mollusca a. Very diverse b. Marine c. Important to humans d. Body plan i. Bilaterally symmetric ii. Reduced coelom iii. Visceral mass iv. May have differentiated head v. Mantle and mantle cavity vi. Foot vii. Shell viii.Radula ix. Nephridia x. Open circulatory system xi. Most have distinct sexes xii. Most have external fertilization xiii.Most marine mollusks undergo spiral cleavage 1. Trochophores 2. Veligers e. Classes i. Polyplacophora (chitons) 1. Marine 2. 8 calcareous plates (no internal segmentation) 3. Grazing herbivores ii. Gastropoda (snails and slugs) 1. Primarily marine 2. Tentacles on head 3. Embryonic development a. Torsion b. Coiling iii. Bivalvia (clams, oysters, scallops, etc.) 1. Mostly marine 2. Dorsal hinge with left and right shells 3. Most are sessile filter feeders 4. No head or radula 5. Siphons iv. Cephalopoda (octopi, squids, etc.) 1. Marine predators 2. Foot evolved into tentacles 3. Highly developed nervous system and intelligence 4. Ink sac 5. Chromatophores 3. Phylum Annelida a. Segmented worms
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b. 2/3 marine, 1/3 earthworms c. Body plan i. Segments with septae ii. Anterior sensory organs iii. Ventral nerve cord iv.
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