2. Body Plan of a Rotifer
mouth
modified pharynx
one of two ciliated lobes at head
cluster of nerve cells
gastric gland
protonephridium
stomach
intestine
cloaca
anus
gland that secretes cementing
substance for “toe”
one of two “toes”
3. 12,000 species
caracteristic
500,000 possible
Cylindrical body
Only longitudinal muscles
Noncellular cuticle with several layers
Pseudocoelomate
Mouth and anus
Found everywhere
Soil
Oceans
Polar ice
Hot springs
Parasites of nearly all plant
and animal species!
4. caracteristic
1.
2.
3.
4.
Bilateral, triploblastic, unsegmented worms
Acoelomate; body cavity is hemocoel
Presence of cuticle that is molted
Body round and under high pressure due to compressed
state of muscles and inelastic cuticle
5. Aquatic or found in a thin film of water; gas exchange by
diffusion
6. Digestive system (complete): Mouth, muscular pharynx,
intestine, anus
7. Nervous system: Brain with dorsal and ventral nerve cords;
cytoplasmic extensions from muscles to nerves
8. Presence of cephalic sense organs called amphids
9. Presence of dorsal and ventral longitudinal muscles; move
by alternative contraction and relaxation of muscles
(Circular muscles not required due to HP)
10. Dioecious with separate sexes; internal fertilization
5. Ciri umum
Bentuk tubuh bulat spt benang
Tidak beruas-ruas
Saluran pencernaan sempurna krn memiliki mulut
dan anus
Ada yang mikroskopis dan ada yang makroskopis
Bersifat gonokoris, betina lebih besar dari pada
jantan
Ada yang parasit ada yang hidup bebas
6. Dibedakan menjadi 2 kelas :
1. Kelas Nematoda
Contoh :
1. Ascaris lumbricoides
2. Wuchereria brancrofti
3. Enterobius vermicularis
5. Ancylostoma duodenale
2. Kelas Nematomorpha
Contoh :
1. Gordius sp
2. Nectonema
9. Ascaris lumbricoides
• Roundworm of man
• 1.2 billion people
– Many in southeast US
• Females lay 200,000
eggs a day
• Unsanitary habits
contaminate ground
• Night soil
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10. Life Cycle of Ascaris Lumbricoides
Source: Redrawn From Centers for Disease Control, Atlanta, GA.
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