Bootlace and Annelid worms

Phylum- Nemertea
Bootlace or ribbon worms, bilateral triploblastic lophotrochozoans, feed with hollow muscular snout, mostly carnivores & inject toxins, digestive tract with mouth and anus, blood circulates in vessels, Protonephridia for excretion, long nerve cords
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Phylum- Annelida
'Little ring', metameric (repeated) segments, body wall with longitudinal and circular muscles, large coelom lined with mesodermal epithelium, thin body wall (gas diffusion, needs to be moist)
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Describe locomotion in annelids
Undulate (smooth wave motion) to swim, fluid in coelom acts as hydrostatic skeleton & enables muscles to work against each other
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Name the 3 classes in annelida
Oligochaeta, Hirudinea, Polychaeta
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Oligochaeta
Earthworms & some other terrestrial worms, 4 bundles of chaetae (segment)
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How do earthworms reproduce?
Clitellum becomes sac for eggs, hermaphrodites, worms lie side by side head to tail and exchange sperm
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Hirudinea
Leeches, sucker at each end, no chaetae, 3 jaws, secrete anticoagulant, hirudin and anaesthetic to stop blood clot and host feeling anything
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Polychaeta
'Many bristles', nearly all marine, soft sediment, filter prey, stiff chaetae to provide traction, most have separate sexes
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What are 2 examples of reproductive strategies in Polychaeta?
Environmental sex determination (2 females, chemical from larger female causes smaller to change to male), Epitoky (segments fill with gametes -Epitokes- and these split off and burst releasing gametes, epitokes can sometimes be to whole worm)
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Card 2

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Phylum- Annelida

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'Little ring', metameric (repeated) segments, body wall with longitudinal and circular muscles, large coelom lined with mesodermal epithelium, thin body wall (gas diffusion, needs to be moist)

Card 3

Front

Describe locomotion in annelids

Back

Preview of the front of card 3

Card 4

Front

Name the 3 classes in annelida

Back

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Card 5

Front

Oligochaeta

Back

Preview of the front of card 5
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