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Septa
Thin membranous folds, divides coelom.
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Metamerism
Repetition of body segments.
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Metamere
A repeated segment found in metamerism
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Metanephridia
Excretory system of the Annelids, removes waste from the blood as well as the coelomic fluid.
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Parapodia
Appendages used in respiration and locomotion.
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Acicula and setae
Reinforce parapodia.
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Circular muscle and Longitudinal muscle
Allow locomotion through peristaltic waves.
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Oblique muscles
Create elliptical motion for parapodia, causing propulsion.
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Class Oligochaeta
Earthworm; Freshwater and terrestrial, only 4 pairs of setae per segment.
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Class Polychaeta
Clamworm; Marine only worms, a large amount of setae per segment, makes up almost 2/3rds of the phylum.
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Class Hirudinea
Leeches; Freshwater and marine, parasitic.
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Respiratory capillaries
Small blood vessels that do gas exchange, found on the parapodia.
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Clitelum
Membranous section of the earthworm, forms cocoon for eggs.
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Egg capsule
Mucus like secretion of the clitelum, houses eggs.
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Seminal vesicle
Stores sperm cells created by the earthworm, used to deliver to another worm.
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Seminal receptacle
Used to store sperm from other worms for a short time.
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Oviduct
Eggs are secreted here into the egg capsule.
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Gizzard
Where the worm churns the dirt it eats, mechanical digestion.
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Typhlosole
Adds surface area and rigidity to the intestine, runs the length of the intestine.
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Dorsal vessel
Blood vessel that pumps blood via peristaltic motion forward toward anterior of the worm.
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Aoritc arches
Acts as the heart of the earthworm, pumps blood through the ventral vessel.
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Vetral vessel
Blood is distributed throughout the body by this vessel.
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Anterior and posterior suckers
Found on leeches only, they attach themselves to hosts using these.
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