ch. 11 aschelminthes filech. 11 aschelminthes 7 different phyla. characteristics • has a...
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![Page 1: Ch. 11 Aschelminthes fileCh. 11 Aschelminthes 7 different Phyla. Characteristics • Has a pseudocoel-fluid filled body cavity. • Microscopic to 1 meter long. Characteristics •](https://reader031.vdocument.in/reader031/viewer/2022022806/5cca772a88c993b6028b58da/html5/thumbnails/1.jpg)
Ch. 11 Aschelminthes
7 different Phyla
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Characteristics
• Has a pseudocoel-
fluid filled body cavity.
• Microscopic to 1
meter long.
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Characteristics
• Round.
• Tough external
cuticle.
• Mostly in fresh water.
• Complete digestive
system. Mouth,
intestine, anus.
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Myxozoa
Arthropoda Annelida
Mollusca
Lophophores
Hemichordata
Chordata
Other
pseudocoelomates
Nematoda
Porifera
Ctenophora
CnidariaPlacozoa
Platyhelminthes
Nemertea
Ciliophora
Sarcomastigophora
Microspora
Apicomplexa
Mesozoa
Echinodermata
CrustaceaChelicerata
Uniramia
Other Chordata
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Phylum Nematoda (Roundworms)
• Eat organic material.
• Up to several meters
long.
• Many are parasites of
plants or animals.
• Live in water or soil.
1st land animals.
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Reproduction of Ascaris
• Separate sexes.
• Internal fertilization.
• Release up to
200,000 eggs daily.
• 4 molts (stages of life
cycle).
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Nematode Reproductive Systems
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Movement of Roundworms
• Longitudinal muscles
contract, forcing wave
motion of hydrostatic
skeleton.
• This stretches the
cuticle on other side.
• Causes a thrashing
motion.
• No circular muscles
for crawling.• Roundworm moving
• https://www.youtube.com/watch?v=tp-
O3LME3OU
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Nematodes and crops
• Negative impacts
• https://www.youtub
e.com/watch?v=Zr
ogAKO3dhI
• Positive impacts
• https://www.organi
ccontrol.com/produ
ct/38/beneficial-
nematodes