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Invertebrate Overview

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Presentation on theme: "Invertebrate Overview"— Presentation transcript:

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

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5 Bilateral-

6 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

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10 asymmetrical

11 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

12 Reproduce externally 2 stages-polyp and medusa Stinging cells-nematocysts

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

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17 Phylum Nematoda-roundworms

18 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

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

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25 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

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28 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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