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Invertebrate Overview

Invertebrate Overview. Body Symmetry. Radial Symmetry-body parts that repeat around center body-Cnidaria and Echinodermata Bilateral Symmetry-imaginary plane divides animal into to equal parts-Platylhelminthes ,Nematoda,Annelida,Mollusks,Arthropoda Asymmetrical-no front back or sides-Porifera.

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Invertebrate Overview

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  1. Invertebrate Overview

  2. Body Symmetry • Radial Symmetry-body parts that repeat around center body-Cnidaria and Echinodermata • Bilateral Symmetry-imaginary plane divides animal into to equal parts-Platylhelminthes ,Nematoda,Annelida,Mollusks,Arthropoda • Asymmetrical-no front back or sides-Porifera

  3. Radial Symmetry

  4. Bilateral-

  5. Phylum Porifera • Pores all over the body • Multicellular • Heterotrophic • No cell walls • Coanocytes-specialized cells that use flagella to move water through • Spicules-in some sponges and is a hard-skeleton –like substance • No particular nervous system • Reproduction is internal fertilization,larvae released into water • Gemmules-layer of archaeocytes surrounded by spicules—asexual budding under harsh conditions

  6. asymmetrical

  7. Cnidaria • Hydra,jellyfish,corals,sea anemones • 1)Class Scyphozoa-jellyfish-reproduce sexually/seen mostly as medusa • 2)Class hydrozoas-hydras(fresh water) ,Portugese-Man-of-War-mostly in polyp stage 3)class Anthozoa-sea anemone and corals-only polyp stage-reproduce asexually by releasing eggs and sperm into water/some can reproduce asexually

  8. Reproduce externally • 2 stages-polyp and medusa • Stinging cells-nematocysts

  9. Platylhelminthes • Flatworms • Flukes,planaria and tapeworms • 3 classes: 1)turbellaria-planaria/ 2)Trematoda-flukes-parasitic/ 3)cestoda • Hermaphrodites that reproduce sexually • Regeneration

  10. Phylum Nematoda-roundworms

  11. Nematoda • Some are parasitic • Reproduce sexually and usually have separate sexes • Parasitic varieties include ones causing trichinosis,filarial,ascarid and hookworms • Sexual reproduction,other systems have also made advances

  12. Phylum Annelida • Class Oligochaetes-earthworms • Class Hirudinea-leeches • Class Polychaetes-sandworms and bloodworms • Most reproduce sexually • 2 major groups of muscles • Nephridia

  13. Phylum Mollusca • Soft-bodied animals that usually have an external or external shell • Body usually has 4 parts-foot,mantle,shell and visceral mass • 1)class Gastropoda-snails and slugs/shell-less or single shell/muscular foot • 2) Bivalves-2 shells held by muscle…clams,etc. • 3) Cephalopods-soft bodied w/tentacles—octupi and squids

  14. Phylum Arthropoda • Insects,crabs,lobsters,shrimp,spiders • All have a tough exoskeleton • 1)subphylum-Crustacea-attenae,3 body sections,chewing mandibles/crayfish,etc, • 2)subphlum chelicerata-horseshoe crabs,spiders,ticks,scorpions-2 body sections and 4 pairs of walking legs • 3) subphylum Uniramians-1pair attenae and unbranched appendages-insects

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