KingdomAnimalia PhylumAnnelida ClassOligochaeta OrderOpisthopora FamilyLumbricidae GenusLumbricus.
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Transcript of KingdomAnimalia PhylumAnnelida ClassOligochaeta OrderOpisthopora FamilyLumbricidae GenusLumbricus.
EarthwormsKingdom AnimaliaPhylum Annelida
Class OligochaetaOrder OpisthoporaFamily LumbricidaeGenus Lumbricus
Earthworm Facts
Except for the first and last segments, all
body segments have the same sets of organs.
Earthworm Facts - Skin
• They do not have lungs.–They breathe through their moist
skin. If their skin dries out, they will die.
• They do not have eyes– They use light sensitive skin cells
to sense light.
Earthworms obtain food by extending their mucus covered pharynx
Food is then pumped into the esophagus
Food moves to the crop where it can be
stored until…
it is moved into the gizzard where it is ground
into smaller pieces
finally the food is absorbed in the
intestine
Earthworm Facts – Digestive System
Earth worms have a closed circulatory system - blood stays in blood
vessels.
Earthworm Facts – Circulatory System
Aortic arches – Act as hearts; providing pulsation for blood
Earthworm Facts – Circulatory System
Earthworms have 2 major blood vessels that run from head to tail.
1. Dorsal blood vessel - (on the worm’s back) carries blood from the tail to the head
2. Ventral blood vessel - ( on worm’s belly) carries blood from head to tail
Earthworm Facts – Circulatory System
Earthworm Facts - Excretion
Digestive waste passes through
the anus.
Cellular waste is filtered our through the nephridia.
Earthworm Facts – Reproductive System
Earthworms contain both male and female reproductive organs, but they
do not self fertilize.
Seminal Vesicles
Produce Sperm
Seminal Receptacles
Store sperm after mating
Ovaries
Produce Eggs
Earthworm Facts - Clitellum
When eggs are ready to be fertilized the clitellum produces a thick mucus
ring. Eggs and sperm are released into this mucus ring, which is
detached and becomes and egg case.
Identifying Structures
Structure ColorPharynx GrayBrain Dark GreenAortic Arches RedEsophagus Light GreenCrop OrangeGizzard Light BrownNephridia YellowIntestine Dark BrownDorsal Blood Vessel RedVentral Blood Vessel RedOvary PinkOviduct PinkSeminal Vesicles Light BlueSeminal Receptacle PurpleTestes Dark BlueCentral Nerve Cord Pick a color you haven’t used
Describe the
function of each
structure.