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Presentation on theme: "WORMS."— Presentation transcript:


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


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

5 Blood Fluke

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

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

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

9 Movement Cillia Muscle cells

10 Reproduction Hermaphrodites Asexual by fission

11 Groups of Flatworms

12 Turbellarians Free-living Marine or fresh water

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


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

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


18 Roundworms

19 Unsegmented Most are freeliving Digestive tract with two openings

20 Form and Function

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

22 Respiration, Circulation, Excretion
No internal transport- diffusion

23 Response Ganglia from head Simple structures to detect chemicals

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

25 Reproduction Sexually Internal fertilization

26 Human Disease

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

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


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


32 Annelids

33 Body segments True coelom lined with mesoderm

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



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

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



41 Oligochaetes- Earthworms

42 Hirudinea- Leeches



45 Polychaetes 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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