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Ch. 28 – Simple Invertebrates Ch. 28 – Simple Invertebrates

Ch. 28 – Simple Invertebrates - PowerPoint Presentation

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Ch. 28 – Simple Invertebrates - PPT Presentation

Section 281 Sponges Sponges were once classified as plants Asymmetrical Lack tissues and organs Cell recognition makes them animals The Simplest Animals Sponges belong to Phylum Porifera System of pores ID: 779032

sponges reproduce phylum body reproduce sponges body phylum reproduction cnidarians flatworms asexually tentacles composed animals sea tissues corals carbonate

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Slide1

Ch. 28 – Simple Invertebrates

Slide2

Section 28.1

Sponges

Slide3

Sponges were once classified as plants

Asymmetrical

Lack tissues and organs

Cell recognition makesthem animals

The Simplest Animals

Slide4

Sponges belong to Phylum

Porifera

System of pores

OstiaPores that let water into spongeOsculaPores that let water exit

Larger than ostiaSessile

The Simplest Animals

Slide5

Prevent sponge body from collapsing on itself

Composed of spicules

Tiny needle composed of silica or calcium carbonate

Some sponges contain sponginFlexible protein fiber

Sponge Skeletons

Slide6

3 Types of Sponges Based on Their Skeleton

Calcareous

Spicules composed of calcium carbonate

GlassSpicules made of silica

Demosponge

Spongin

Types of Sponges

Slide7

Can reproduce asexually

Regenerate when cut into pieces

Commonly reproduce by shedding fragments

Also reproduce sexuallyHermaphrodites

Reproduction

Slide8

Section 28.2

Cnidarians

Slide9

Phylum

Cnidaria

Jellyfish

Sea anemone

Hydras

Corals

Slide10

Medusa

Umbrella-shaped

Polyp

TubelikeBoth have radial symmetry

Cells arranged into tissues

2 Body Forms

Slide11

Characteristic specific to Cnidarians

Stinging cells found on tentacles

Nematocyst

Barbed harpoon within cnidocytesSome contain deadly toxins

Cnidocytes

Slide12

Most primitive cnidarians

Life cycle contains polyp and medusa stages

Some found in freshwater

HydraUse basal disk to attach to objects

Marine HydrozoansMore complex than freshwater formsForm colonies

Reproduction

Sexual and asexual reproduction

Some species are hermaphrodites

Hydrozoans

Slide13

True jellyfish

Range in size from a few cm to several feet in diameter

Medusas

Reproduce sexually

Scyphozoans

Slide14

Anthozoans

Largest class of cnidarians

Polyps

Brightly colored sea anemones and corals

Tubelike body topped with tentacles

Reproduce sexually and asexually

Sea Anemones

Feed on fish that swim near their tentacles

Reproduce asexually by pulling self in half

Corals

Found in colonies

Stonelike

outer skeleton of calcium carbonate

Only outer layer of coral is alive

Slide15

Section 28.3

Flatworms and Roundworms

Slide16

Largest group of acoelomate worms

Tissues organized into organs

Bilateral symmetry

Belong to phylum PlatyhelminthesTurbellariaCestodaTrematoda

Flatworms

Slide17

Most are marine flatworms

Freshwater flatworms

Planaria

Have ability to be cut in half and regenerate

Reproduction method

Turbellaria

Slide18

Parasitic tapeworms

Attach themselves to the intestinal wall of host

Proglottids

String of rectangular body sectionsMay reach 40 ft. longCommonly infect humans when they eat infected meat that is undercooked.

Cestoda

Slide19

Largest flatworm class

Parasitic worms called flukes

Endoparasites

contain tegument preventing them from being digested by hostSuck body fluids from host using pharynxLake itchBurrows under skin

Trematoda

Slide20

Common canine parasites

Members of phylum

Nematoda

PseudocoelomLong, cylindrical bodies

Roundworms

Slide21

Trichinella

spiralis

common roundworm that infects humansCauses trichinosisCommonly occurs due to eating undercooked pork

Roundworm Infection