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WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.

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Presentation on theme: "WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without."— Presentation transcript:

1 WORMS

2 Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without colelom Acoelomates-without colelom

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4 Speckled Flatworm Clings onto lower rocks. Clings onto lower rocks. Eats amphipods by engulfing them with mucus and swallowing them whole! Eats amphipods by engulfing them with mucus and swallowing them whole!

5 Blood Fluke

6 Form and Function Feeding: Feeding: Carnivores, parasitic Carnivores, parasitic Mouth with pharynx (muscular tube that moves food and waste) Mouth with pharynx (muscular tube that moves food and waste)

7 Respiration, Circulation, Excretion Use diffusion for transport Use diffusion for transport Some have flame cells to filter and remove waste Some have flame cells to filter and remove waste Many flame cells form tubes that lead to pores on the skin Many flame cells form tubes that lead to pores on the skin

8 Response Ganglia for control (nerve cells). Ganglia for control (nerve cells). Eyespot – detect light. Eyespot – detect light. Some have specialized cell to detect chemicals,food,etc. Some have specialized cell to detect chemicals,food,etc.

9 Movement Cillia Cillia Muscle cells Muscle cells

10 Reproduction Hermaphrodites Hermaphrodites Asexual by fission Asexual by fission

11 Groups of Flatworms

12 Turbellarians Free-living Free-living Marine or fresh water Marine or fresh water

13 Flukes Parasitic Parasitic Infect internal organs Infect internal organs Blood flukes-works its way into your intestines Blood flukes-works its way into your intestines Multiple host Multiple host

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15 Schistosomiasis- fluke eggs clot blood vessels, causing swelling of tissue. Schistosomiasis- fluke eggs clot blood vessels, causing swelling of tissue. Caused by human waste in water supply. Caused by human waste in water supply.

16 Tapeworms Parasitic Parasitic Lives in intestines Lives in intestines Long and flat Long and flat Scolex- suckers or hooks Scolex- suckers or hooks

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18 Roundworms

19 Unsegmented Unsegmented Most are freeliving Most are freeliving Digestive tract with two openings Digestive tract with two openings

20 Form and Function

21 Feeding Most are carnivores Most are carnivores Use mouth parts and spines to catch food Use mouth parts and spines to catch food Some eat algae Some eat algae Some are decomposers Some are decomposers

22 Respiration, Circulation, Excretion No internal transport- diffusion No internal transport- diffusion

23 Response Ganglia from head Ganglia from head Simple structures to detect chemicals Simple structures to detect chemicals

24 Movement Hydrostatic skeleton Hydrostatic skeleton Muscles and fluid in the pseudocoelom work together to produce movement Muscles and fluid in the pseudocoelom work together to produce movement

25 Reproduction Sexually Sexually Internal fertilization Internal fertilization

26 Human Disease

27 Trichinosis Lives in intestines of mammals Lives in intestines of mammals 1. Females burrow into intestinal wall 1. Females burrow into intestinal wall 2. Eggs into larvae travel to organs by bloodstream. 2. Eggs into larvae travel to organs by bloodstream.

28 Filarial Worms Live in blood vessels Live in blood vessels Transmitted by mosquitoes Transmitted by mosquitoes Can block the movement of fluids Can block the movement of fluids Elephantiasis Elephantiasis

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30 Ascaris 1. Eggs hatch in intestines 1. Eggs hatch in intestines 2. Burrow into bloodstream to lungs 2. Burrow into bloodstream to lungs 3. Travel to air passages, then swallowed 3. Travel to air passages, then swallowed 4.Carried to the intestines 4.Carried to the intestines

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32 Annelids

33 Body segments Body segments True coelom lined with mesoderm True coelom lined with mesoderm

34 Form and Function Feeding and digestion Feeding and digestion Filter feeders to predators Filter feeders to predators In earthworm pharynx to esophagus to crop to gizzard to intestine In earthworm pharynx to esophagus to crop to gizzard to intestine

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37 Circulation- closed system, Two major blood vessels Circulation- closed system, Two major blood vessels Dorsal runs to the head, Ventral to the tail Dorsal runs to the head, Ventral to the tail Respiration- Through the skin, gills in aquatic annelids Respiration- Through the skin, gills in aquatic annelids Excretion- Nephridia filters fluid in the coelom, anus for the digestive tract Excretion- Nephridia filters fluid in the coelom, anus for the digestive tract

38 Movement- Hydrostatic, setae Movement- Hydrostatic, setae Reproduction- Most are sexual, Hermaphrodites Reproduction- Most are sexual, Hermaphrodites Clitellum used to form mucus ring Clitellum used to form mucus ring

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40 GROUPS OF ANNELIDS

41 Oligochaetes- Earthworms

42 Hirudinea- Leeches

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45 Polychaetes Sandworms, bloodworms Sandworms, bloodworms

46 Earthworm Dissection

47 External View

48 Internal Structure

49 Pharynx

50 Aortic Arches

51 Seminal Vesicle

52 Seminal Receptacle

53 Septum

54 Crop

55 Gizzard

56 Intestine

57 Ventral Nerve Cord

58 Dorsal Blood Vessel


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