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Current Events 1st 2009






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    Current Events 1st 2009 Current Events 1st 2009 Presentation Transcript

    • Invertebrate Phylum
    • Phylum Poriferia
    • Phylum Porifera Main Characteristics Sponges thought to be the most primitive of animals -  Believed to have been formed by the uniting of protozoa to a colonial organism. -contain an internal skeleton of spicules made of or  silica (glass like). Classified by these spicules. - -Reef related, found particularly in localized zones  within China. -mostly asexual reproduction Sessile for most of life cycle  No symmetry  Pores in body wall allow water to enter 
    • Spongia (Euspongia) Typical bath sponge
    • Stelligera stuposa
    • Cnidarian Phylum
    • Main Characteristics Radial symmetrical  include the hydroids, jellyfish, anemones, and  corals have tentacles with stinging cells in their tips  which are used to capture and subdue prey one of two basic body types, polypoid or  medusoid. Cnidarians have a true mouth and digestive  cavity, but no anus. What goes in, also must come out the same opening
    • Jelly fish
    • Coral
    • Phylum Platyhelminths
    • Major Characteristics Flat worms   Bilaterally symmetrical  Cephalization  Incomplete digestive systems  Some parasitic
    • Nematodes
    • Major Characteristics •Round worms •2 openings •Many are parasitic •bilaterally symmetric •diverse range of habitats including soil, fresh water, oceans and as internal parasites of vertebrates •Decomposers, important for soil health
    • Heart worm in dog
    • Mollusks
    • Characteristics Open circulatory system   Foot for movement  Includes snails, slugs, clams, scallops, octopi, and squid
    • Gastropods Banana slug Snail
    • Bivalves clam
    • Cephalopods squid
    • Giant Squid •An underwater creature the length up to 18 meters, with eyes the size of your head.giant sucking tentacles that cover eight arms, each longer than your car. •Until recently have not been seen alive!
    • Annelids
    • Major Characteristics Segmented worms  Full digestive track  Hearts  Nervous system and a brain  2 types of muscles  Sexual reproduction  9,000 species of Annelids known today,  including worms and leeches.
    • Bilateral symmetry, full digestive track.
    • leech
    • Candy Striped Worm
    • Arthropods
    • Major Characteristics Tough exoskeleton  Jointed appendages  Segmented body  Spiracle tubes for respiration  Complex respiration  Largest phylum over 1,000,000 species  Includes insects, crabs, spiders, tics, and  shrimp
    • Tiger beetle Sow bug
    • Wolf spider Crab
    • Echinoderms
    • Major Characteristics Radial symmetry  Internal skeleton  No brain  Tube system filled with water for movement  Complex reproductive cycle  One opening  radial symmetrical  Spiny skins 