Coelomate true body cavity cavity completely lined

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Coelomate- true body cavity- cavity completely lined with mesoderm derived tissue. Phylum: platyhelminthes. Platy- “flat” helmis= “ worm” Acoelomates in marines, freshwater, damp habitat. Class turbellaria- free-living flatworms ex planaria Class trematoda- parasitic flatworms ex flukes Class cestoda- parasitic flatworms ex tapeworms Phylum nematoda ~~~~ wallahi they are nasty looking worms. Round worms from 1mm to 1m length Pseudocoelomates Parasitic Molt- shed outer cuticle during growth Among most numerous of all animals in a species ( estimate 500,000) and # individuals Most are free- living, important decomposers Some parasitic: heartworms, trichinella --- trichinosis ( from pork) C. elegans, widely studied~ 1000 cells ( mature human ~ 60 trillion cells ) Phylum Annelida-- Worms
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coelomates , anellus= “ring” Segmented body - repeating units Ex earthworms, leeches Terrestrial, marine, freshwater Earthworms decompose organic matter, soil aeration Phylum Mollusca~~~ Slugs Coelomates Soft body, most protected by hard calcium carbonate shell Anatomy Viscera mass- most internal organs mantle - shell secreting tissue over visceral mass. Foot- muscle for movement Radula- tiny teeth used for scraping organ for eating Class polyplacophora “ bearer of many plates” chitons-often attached to racks in tidal zone Class gastropoda- “ belly foot” get it they move using their stomach!!!! Ex: snails slugs, nudibranchs ( sea slug) Fresh water, salt water, terrestrial Class Bivalvia- “double folding doors” Clams, oysters, mussels, scalpes Class cephalopoda- “ head foot” octupuses Tend to be faster, predators Octopi lack shells Squids have small internal shells Chambered nautilus have shells Giant squids largest of invertebrates. Phylum Arthropoda (jointed foot”) Appendages specialized for walking, feeding, sensory, defense, etc Lobsters, spiders, insects, etc 1>10 6 species identified
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80 % of living animal species Exoskeleton~ external skeleton ( protein and chitin, protection, prevents desiccation~ drying out, attachment for muscles, molts during growth. Subphylum Chelicerata Chelicerae- feeding appendages used as pincers or fangs Lack antennae have 4 pair legs on cephalothorax The spiders have eight legs Class Arachnida- spiders, scorpions, ticts, mites Most terrestrial Subphylum myriapoda ( myria= many, poda= feets) Class chilopoda-centipedes Carnivores 1 pair legs per segment Class diplopoda- millipedes Decomposers- eat decaying plans 2 pair legs per segment Subphylum: Crustacea- lobsters, crab, shrimp, crayfish, barnacles, krill.
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  • Fall '19
  • phloem, Phylum

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