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Earthworms Earthworms Phylum Annelida Phylum Annelida Class Oligochaeta Class Oligochaeta

Earthworms Phylum Annelida Class Oligochaeta. Where do earthworms live? They live in burrows in the dirt They live in burrows in the dirt They tunnel

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Page 1: Earthworms Phylum Annelida Class Oligochaeta. Where do earthworms live? They live in burrows in the dirt They live in burrows in the dirt They tunnel

EarthwormsEarthwormsPhylum AnnelidaPhylum Annelida

Class OligochaetaClass Oligochaeta

Page 2: Earthworms Phylum Annelida Class Oligochaeta. Where do earthworms live? They live in burrows in the dirt They live in burrows in the dirt They tunnel

Where do earthworms live?Where do earthworms live?

They live in burrows in the dirtThey live in burrows in the dirt

They tunnel in the soil– this They tunnel in the soil– this helps the soil become loosehelps the soil become loose

It also cycles nutrients & lets air It also cycles nutrients & lets air inin

Page 3: Earthworms Phylum Annelida Class Oligochaeta. Where do earthworms live? They live in burrows in the dirt They live in burrows in the dirt They tunnel
Page 4: Earthworms Phylum Annelida Class Oligochaeta. Where do earthworms live? They live in burrows in the dirt They live in burrows in the dirt They tunnel

How do they move?How do they move?

They crawl using muscle They crawl using muscle contractions that shorten contractions that shorten and lengthen the bodyand lengthen the body

They can grip the soil using They can grip the soil using seteasetea or little hairs on the or little hairs on the ventral surfaceventral surface

Lots of mucusLots of mucus

Page 5: Earthworms Phylum Annelida Class Oligochaeta. Where do earthworms live? They live in burrows in the dirt They live in burrows in the dirt They tunnel
Page 6: Earthworms Phylum Annelida Class Oligochaeta. Where do earthworms live? They live in burrows in the dirt They live in burrows in the dirt They tunnel

External FeaturesExternal Features

Sensitive skin – can Sensitive skin – can sense light, touch & sense light, touch & chemicalschemicals

Mouth, anus, clitellum, Mouth, anus, clitellum, many segmentsmany segments

Page 7: Earthworms Phylum Annelida Class Oligochaeta. Where do earthworms live? They live in burrows in the dirt They live in burrows in the dirt They tunnel

What do earthworms eat?What do earthworms eat?

Soil and the organic material in itSoil and the organic material in itThe food enters the mouth and The food enters the mouth and

pharynx where saliva gets it moistpharynx where saliva gets it moistThe crop stores it and the gizzard The crop stores it and the gizzard

grinds it upgrinds it upThe intestines absorb nutrients, the The intestines absorb nutrients, the

anus expels waste (castings)anus expels waste (castings)

Page 8: Earthworms Phylum Annelida Class Oligochaeta. Where do earthworms live? They live in burrows in the dirt They live in burrows in the dirt They tunnel

Respiration, Circulation, Nervous Respiration, Circulation, Nervous SystemSystem

Diffusion of gases through Diffusion of gases through skinskin

5 pairs of hearts (10), 2 5 pairs of hearts (10), 2 main blood vesselsmain blood vessels

Simple nervous system with Simple nervous system with cerebral ganglion & ventral cerebral ganglion & ventral nerve cordnerve cord

Page 9: Earthworms Phylum Annelida Class Oligochaeta. Where do earthworms live? They live in burrows in the dirt They live in burrows in the dirt They tunnel
Page 10: Earthworms Phylum Annelida Class Oligochaeta. Where do earthworms live? They live in burrows in the dirt They live in burrows in the dirt They tunnel

ReproductionReproductionHermaphroditicHermaphroditic2 worms come together 2 worms come together

ventrally and exchange spermventrally and exchange spermLater the each worm excretes a Later the each worm excretes a

cocoon surrounding the worm, cocoon surrounding the worm, as it slides forward, the sperm is as it slides forward, the sperm is released and the eggs fertilized released and the eggs fertilized the worm slips out of the cocoonthe worm slips out of the cocoon

Page 11: Earthworms Phylum Annelida Class Oligochaeta. Where do earthworms live? They live in burrows in the dirt They live in burrows in the dirt They tunnel
Page 12: Earthworms Phylum Annelida Class Oligochaeta. Where do earthworms live? They live in burrows in the dirt They live in burrows in the dirt They tunnel