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Flatworms, Mollusks, and Annelids

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Katelynn Dorn

on 26 February 2015

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Transcript of Flatworms, Mollusks, and Annelids

23.3 Flatworms, Mollusks, and Annelids
Flatworms are simple bilateral animals.
Mollusks are diverse animals.
Annelids have
segmented bodies.
incomplete or absent gut
no circulatory system
diffuse oxygen
simple brain
pharynx leads from mouth to gut
hunt using chemoreceptors
have muscles and cilia
parasites- feed on body fluids
mouth - pharynx - gut
Schistosoma- infects TWO hosts
live in guts
mouth with hooks
absorb nutrients- no gut
infect multiple hosts
Mollusk Anatomy
complete digestive tract
radula- like a tongue with teeth
mantle- area of tissue covering organs (some have a shell)
ctenidia- gills that absorb oxygen in water mollusks
hemocoel- space between cells that pumps blood to the foot
Classes of Mollusks
- snails, nudibranchs, abalones, limpets
Bivalves (Pelecypoda)
- clams, oysters, mussels, scallops
- squid, octopuses, nautiluses, cuttlefish
Scaphopoda- tusk shells
Polyplacophora- chitons
Aplacophora- wormlike
Tryblidia- deep water mollusks
Mollusk Reproduction
many are hermaphroditic
garden snails use 'love darts'
calcium-rich, mucus dart fired at one snail
causes snail to produce packet of sperm
sperm transferred to recipient
eggs laid in underground nests and hatch in 2-4 weeks
digestive tract, nerve cord, blood vessels
closed circulatory system
longitudinal and circular muscles
coelom- fluid-filled space that helps worm crawl
Annelid Diet
eat organic waste
secrete castings
leeches eat blood, insects, snail larva
Annelid Reproduction
asexual- fragmentation
sexual- earthworms use hermaphroditic cross-fertilization
marine worms have separate male and females
larva develop segments
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