Biology 20 – Kingdom Animalia – Phylum Annelida Notes
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Phylum Annelida (Pg. 696)
This phylum includes the _________________________.
The most commonly known worms in this phylum are ________________
______________________________________________________
Annelids are ________________ symmetrical.
They are found in terrestrial, freshwater and marine environments.
General Characteristics
• Entire body is divided ______________________________________.
• The segment rings are called _____________.
• The first segment is called the ________________ and the second is called
the __________________. These 2 segments form the _____ of the worm.
• They have a _______________________ body plan.
• Annelids have a _____________ body cavity called a __________ which
is lined with ________________.
• They are the simplest of animals that have a _______________________.
• The body of annelids & the remaining Phyla of animals have ___________
The 3 Germ Tissue Layers
• These 3 layers produce all of the tissues of the body:
• _________ produces: skin (outer layer), nervous system, cornea & lens, etc
• _________ produces: notochord, skeleton, muscles, circulatory system, etc.
• _________ produces: digestive tract, lung epithelium, liver, many
endocrine glands, etc.
Systems
Annelids have well developed _________________________.
• __________- 2 layers of muscle (______________ and _______ muscles).
Each segment’s muscles are independent of the other segments.
 Locomotion accomplished by muscles along with __________ (Nereis),
or _________ (hair-like bristles) (earthworms).
• Digestive- Complex. Eg. Earthworm – _____________________________
______________________________________________________
• Their digestive system has 2 __________________________________
• Excretory- a pair of _______________ per segment which remove
___________________________ from the body.
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Biology 20 – Kingdom Animalia – Phylum Annelida Notes
• Respiratory -through _________, some through parapodia; tubeworms
have ______________.
• Circulatory- _________________________________, red blood that uses
________________ as oxygen carrier.
• Nervous- dorsal _______; ________________, with __________ in each
segment. Responsive to touch, light, moisture & temperature
• Reproductive Many are ________________ (both sex organs) but they cannot fertilize
themselves. Sex organs located in the _______________ region.
 Must exchange sperm with another worm.
 Eggs are laid in a cocoon.
Helpful & Harmful
• Helpful
 _______________________________
 _________________________________
 __________________________________________________________
__________________________________________________________
• Harmful
 ___________________________________
Class Polychaeta - Nereis (clam worm)
Have a pair of paddle like extensions on each segment called _____________
Aphrodite (sea mouse)
Other Polychaetes: ____________________________________________
Class Hirudinea __________________________________
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