Chapter 27Chapter 27

Round WormsRound Worms

Kingdom…..animalKingdom…..animal Phylum……..nematodePhylum……..nematode

Characteristics of Characteristics of NematodesNematodes

Round worms with no segmentsRound worms with no segments Some are “free living”Some are “free living” Some are parasitesSome are parasites Have digestive system with two Have digestive system with two

openings…..mouth ( anterior end)openings…..mouth ( anterior end)

anus ( posterior end)anus ( posterior end) Tube within a tubeTube within a tube

Nematode StructureNematode Structure

Heart Worm In Our PetsHeart Worm In Our Pets

How does your pet get How does your pet get the heart worm?the heart worm?

a) Immature worm can a) Immature worm can be introduced to your be introduced to your pet by a mosquito bite pet by a mosquito bite the worm matures the worm matures quickly and produces quickly and produces offspringoffspring

The heart and the The heart and the arteries of your pet arteries of your pet can become can become clogged with the clogged with the wormsworms

100% preventable100% preventable

Roundworms and Human Roundworms and Human DiseasesDiseases

AscarisAscaris Intestinal parasiteIntestinal parasite FOund in FOund in

unsanitary areasunsanitary areas

HookwormHookworm Lives in small Lives in small

intestineintestine Sucks blood from Sucks blood from

its hostits host Found in Found in

unsanitary areasunsanitary areas Larva usually enter Larva usually enter

though the footthough the foot

Kingdom: AnimalKingdom: Animal Phylum: AnnelidaPhylum: Annelida

Characteristics of AnnelidsCharacteristics of Annelids

Round worms with segmentsRound worms with segments

What About The What About The Earthworm?Earthworm?

Kingdom:AnimaliaKingdom:Animalia Phylum:AnnelidaPhylum:Annelida Class:ClitellataClass:Clitellata \Order:Haplotaxida\Order:Haplotaxida Suborder:Suborder:LumbricinLumbricinaa

Lumbricus terrestris, the Common Earthworm

External Structure of the External Structure of the EarthwormEarthworm

Internal StructureInternal Structure

Did You KnowDid You Know

The everyday earthworm is a “SHIM”.The everyday earthworm is a “SHIM”. Mucous is needed for the worm to Mucous is needed for the worm to

breathe because it does not have breathe because it does not have lungs.lungs.

It has 5 pairs of pumping vesselsIt has 5 pairs of pumping vessels

Where did earthworms come Where did earthworms come fromfrom

Experts believe that the earthworm Experts believe that the earthworm came from Europe by the settlers came from Europe by the settlers when they brought their plants overwhen they brought their plants over

What do they eat?What do they eat?

Dirt which contains pieces of plants Dirt which contains pieces of plants and animalsand animals

The stool of the earthworm is an The stool of the earthworm is an excellent fertilizerexcellent fertilizer

Food enters the mouth and Food enters the mouth and undigested materials exits the anusundigested materials exits the anus

Earthworms love darknessEarthworms love darkness The sun will dry up their skinThe sun will dry up their skin The light will paralyze them if they The light will paralyze them if they

are exposed to the light for more are exposed to the light for more than an hourthan an hour

Why does the earthworm leave their burrow Why does the earthworm leave their burrow when it rains?when it rains?

Earthworms can survive under water Earthworms can survive under water for several weeks presuming the for several weeks presuming the water is rich in oxygenwater is rich in oxygen

They leave their burrow to travel They leave their burrow to travel overland to new locationsoverland to new locations

Parasitic AnnelidsParasitic Annelids

leechleech