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BSC 2011L Phylum Annelida Segmented worms Circular and longitudinal muscles work against fluid filled coelom to produce changes in width and length Digestion – complete Circluation – closed (5 lateral hearts) Phylum Annelida Class Oligiochaeta Earthworms Found in soil Can reach 3 meters! Phylum Annelida Class Polychaeta Sand worms, feather dusters Almost all marine Live in substrate Phylum Annelida Class Hirudinea Leeches “bloodsuckers” Phylum Annelida Class Oligiochaeta Animal: Symmetry: Body cavity: Digestion: gizzard, etc Circulation: Segmentation: Appendages: Nervous: Habitat: Respiration: Excretion: Locomotion: Support: Earthworm Bilateral coelomate – protostome complete – mouth, esophagus, crop, closed, 5 hearts yes none dorsal brain, ventral nerve cord moist soils diffusion through body surface 2 lateral tubes circular and longitudinal muscles, setae hydrostatic skeleton Earthworm model Earthworm cross-section http://www.deanza.edu/faculty/mccauley/6a-labs-annelid-01.htm Earthworm Dissection Phylum Mollusca Mostly marine but some are freshwater and terrestrial 3 part body Muscular foot – locomotion Visceral mass – internal organs Mantle – encloses visceral mass and may secrete shell Digestion – complete Circulation – open (except for cephalopods that are closed) Phylum Mollusca Class Polyplacophora “many plated” Chitins Phylum Mollusca Class Gastropoda “stomach foot: Phylum Mollusca Class Bivalvia Phylum Mollusca Class Cephalopoda “Head-foot” Phylum Mollusca Class Bivalvia Animal: Symmetry: Body cavity: Digestion: Circulation: Segmentation: Appendages: Nervous: Habitat: Respiration: Excretion: Locomotion: Support: Clam bilateral coelomate – protostome complete, filter feeders open, blue blood, heart, blood vessels none none 3 ganglia connected by nerves aquatic gills nephridia in kidney muscular foot shell Clam model Phylum Mollusca Class Cephalopoda Animal: Symmetry: Body cavity: Digestion: Circulation: Segmentation: Appendages: Nervous: Habitat: Respiration: Excretion: Locomotion: Support: squid bilateral coelomate – protostome complete, beak jaws closed, 3 hearts none 8 arms, 2 tentacles brain of 3 fused ganglia, eye aquatic gills nephridia in kidney muscular mantle, jet propulsion shell reduced to pen