invertebrate c omparative anatomy
DESCRIPTION
Invertebrate C omparative Anatomy. Invertebrates make up 95% of the animal world. While there is a lot of variation among invertebrates, all of them lack a vertebral column. 1. Taxonomy. Domain Eukarya Kingdom Animalia. 2. Invert Phyla (most primative to advanced). - PowerPoint PPT PresentationTRANSCRIPT
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INVERTEBRATE COMPARATIVE ANATOMY
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Invertebrates make up 95% of the animal world. While there is a lot of variation among invertebrates, all of them lack a
vertebral column.
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1. Taxonomya. Domain Eukarya
i. Kingdom Animalia
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2. Invert Phyla (most primative to advanced)
a. Phylum Porifera - Sponges. Sessile filter feeders, no tissues or organs, asymmetrical. Sponges are classified as animals because they lack cell walls and are heterotrophs
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b. CnidariaCorals, jellyfish and anemones. Stinging cells, simplest animals with symmetry.
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c. Phylum Platyhelmenthes
Flatworms. Soft bodied worms that have tissues and internal organ systems, bilateral symmetry and cephalization. Many are parasitic, including flukes and tapeworms.
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Platyhelmenthes
Liver fluke tapeworm
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d. Phylum NematodaRoundworms. Unsegmented worms with a two opening digestive tract. Many are parasitic, including Trichnids, Filarial worms, and Ascarids,
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Nematodes
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e. Phylum Annelidasegmented worms with a true coelom. Includes leeches and earthworms.
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Annelids
Giant Australian Earthworm Leech
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f. Phylum MolluscaSoft bodied animals that have a mantle (foot)and usually a shell. Some have a high degree of cephalization, cephalopods have closed circulatory systems (the others have an open circulatory system). Mollusks include snails, clams, oysters, squid and octopus
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g. Phylum ArthropodaLargest of all phyla. Segmented bodies, exoskeleton and jointed appendages. Three main classes of arthropods include:i. Crustaceans – aquatic arthropods including crabs, lobster, shrimpii. Arachnids – spiders, scorpions, ticks, etc.iii. Insects – 6 legged, 3 segments “bugs”
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Arthropods
crustaceans arachnids
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h. Echinodermata
Spiny skin, endoskeleton, water vascular system and tube feet. Most exhibit radial symmetry. Includes: starfish, sea urchins, sand dollars and sea cucumbers