pg. 33 Phylum Annelida

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pg. 33 Phylum Annelida

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“

Phylum Annelida”

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1-4

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to

answer question

#1

-5.

Ex.

#2 Earthworms, leeches, and marine

bristleworms

#4. it enables different parts of the body to contract or expand independently, duplication of some organs in each segment, and if 1 segment is disabled the other segment can still function

pg. 34 Annelid Classes

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Annelid Classes

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#1. The number of setae per segment and the presence or absence of

parapodia

#2. Live in soil or fresh water, no

parapodia

, have few setae on each segment, includes earthworms

#3.

Polychaeta

means “many bristles”, have many setae, have antennae and specialized mouth parts, live in marine habitats, free swimming predators with strong jaws

#4. 300 species of leeches, have no setae, have suckers on each end of the body, ectoparasites

pg. 35 Outside of Earthworms

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Outside of Earthworms”

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#1

-7.

Ex

.

#2.

Clitellium

- the reproductive organ

#4. Anus- found on last segment, eliminate digestive waste

pg. 36 Earthworm Anatomy

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“Earthworm Anatomy”

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#1

-13.

Ex.

#3- Hearts

#9 Setae

pg. 37 Earthworm Anatomy 2

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Earthworm Anatomy 2

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#1

-6.

Ex.

#1. NONE

pg. 38 Phylum Nematoda

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Phylum

Nematoda

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#1

-5.

Ex.

#4. has 2 openings, food enters one opening (mouth) waste is eliminated through the other (anus)

#5. Food move through the digestive tract in one direction. This allows parts of the digestive system to be specialized for carrying out different functions.

pg. 39 Types of Roundworms

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Types of Roundworms

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Ascaris- Intestinal worm of pigs, horses, and humans, can be so numerous they can block the host’s intestine, female can produce 200,000 eggs per day

Hookworms

- mouth have cutting plates that clamp onto the intestinal wall of the host, feed on the blood of the host, may cause anemia in adults and slowed mental and physical development in children, enter the host through the bottom of the feet, 400 million people affected worldwide

Trichinella

-

live embedded in the host’s intestines, travel through the bloodstream to the muscles and form cysts, people get infected usually when they eat undercooked pork

Pinworms- most common roundworms, do not cause serious disease, live in the lower intestine, female lay eggs around the anus, eggs are picked up by the person’s hand and spread to whatever they touch

Filarial worms- live in the lymphatic system, causes fluid to accumulate in the limbs such as elephantiasis

pg. 40 Parasitic Way of Life

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Parasitic Way of Life”

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Ex.

#3 Have hooks and suckers to cling to the host, have a thick cuticle to keep from being digested by the host

#4 Reproductive, Because they must have a way of mating and dispersing offspring so new host can be found

pg. 41 Phylum Platyhelminthes

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Phylum Platyhelminthes”

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-6.

Ex.

#2.

3 germ layers

#3. because the 3 germ layers are pressed together and there is NO body cavity

#5. There bodies are flat so it puts them in direct contact with their environment, cells exchange gases through diffusion

#6. They have a gastrovascular cavity, Food enters the opening is digested and waste is eliminated through the same opening

pg. 42 Tapeworms

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Tapeworms”

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Ex.

#2.

Almost all vertebrates

#3. Eating raw or undercooked food that contains tapeworm eggs or larvae

#4. They have protective tegument and suckers to attach to the host

pg. 43 Tapeworm Life Cycle

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Tapeworm Life Cycle”

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A human is the primary host.

In the human’s intestines, proglottids

break off and are eliminated with the feces.

Eggs remain alive in the soil or grass for several months.

Grass is eaten by a cow, Eggs develop into larvae and go to cow’s bloodstream.

The larvae burrow into the cow’s muscles and form cysts.

We eat the undercooked beef and the cycle continues.

pg. 44 Fluke Life Cycle

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Fluke Life Cycle”

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Adult flukes have both sexes. Eggs are fertilized by males in the primary host.

Fertilized eggs are excreted in feces or urine.

Fertilized eggs that land in fresh water develop into ciliated larvae that can swim.

The larvae enter a particular species of snail, where they reproduce asexually.

The young flukes leave the snail, climb up blades of grass and form cysts.

A grazing animal eats the grass and the cycle begins again.

pg. 45 Planaria

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Planaria

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Write the following:

DorsalVentral

Anterior

Posterior

Eyespots

Pharynx

No, they are free-living

By using wave-like motions of the body

They are light sensitive organs that can detect changes in the amount of light in the environment

Yes, they have several ganglia

pg. 46 Comparing the Worms

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Comparing the Worms”

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Annelida

Nematoda

Platyhelminthes

Bodies/Body Cavity

Segmented, true body

cavity (Coelomates)

Round, False body cavity (

Pseudocoelomates

)

Flat, No body Cavity (Acoelomates)

Symmetry

Bilateral

Bilateral

Bilateral

Reproduction

Sexual= Cross fertilization (Hermaphrodites)

Asexual= Regeneration

Sexual, with separate Males and Females

Sexual= (Hermaphrodites)

Asexual= regeneration

Nervous System

(Y

or N)

Y

Y

Y

Complete Digestive System (Y or N)

Y

Y

N

Circulatory System (Y

or N)

Y

N

N

Respiratory System (Y or N)

N

N

N

Examples

Earthworms,

Bristleworms

, Leeches

Ascaris

, Hookworms, Pinworms, Trichina, Filarial Worms

Tapeworms,

Flukes,

Planaria