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compare and contrast the morphology of Cestodes, Trematodes, and Nematodes.
Solution
Feature
Nematodes (roundworms)
Cestodes (tapeworms)
trematodes (flukes)
Shape
thread-like, cylindrical bodies; elongate, tapered at both ends
Elongated, flat, ribbon like body
Dorsoventrally flattened, oval; analogous to tree leaf
Segmented
No
Yes with segments called proglottids
No
Symmetry
bilaterally symmetrical
bilaterally symmetrical
bilaterally symmetrical
length
from microscopic to nearly 1 m long
Few mm to serval meters
Few cm to 9 cm
Head end
Suckers & hooks absent. Well-developed buccal cavity
Suckers generally with hooks
Suckers with no hooks
Alimentary Canal
Present; Complete with both mouth and an_s
Absent
Incomplete; no an_s
Body Cavity
Present (pseudocoeloms)
Absent
Absent
Sexes
Mostly dioecious
hermaphroditic
Hermaphroditic except Schisto
Feature
Nematodes (roundworms)
Cestodes (tapeworms)
trematodes (flukes)
Shape
thread-like, cylindrical bodies; elongate, tapered at both ends
Elongated, flat, ribbon like body
Dorsoventrally flattened, oval; analogous to tree leaf
Segmented
No
Yes with segments called proglottids
No
Symmetry
bilaterally symmetrical
bilaterally symmetrical
bilaterally symmetrical
length
from microscopic to nearly 1 m long
Few mm to serval meters
Few cm to 9 cm
Head end
Suckers & hooks absent. Well-developed buccal cavity
Suckers generally with hooks
Suckers with no hooks
Alimentary Canal
Present; Complete with both mouth and an_s
Absent
Incomplete; no an_s
Body Cavity
Present (pseudocoeloms)
Absent
Absent
Sexes
Mostly dioecious
hermaphroditic
Hermaphroditic except Schisto

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compare and contrast the morphology of Cestodes, Trematodes, and Nem.pdf

  • 1. compare and contrast the morphology of Cestodes, Trematodes, and Nematodes. Solution Feature Nematodes (roundworms) Cestodes (tapeworms) trematodes (flukes) Shape thread-like, cylindrical bodies; elongate, tapered at both ends Elongated, flat, ribbon like body Dorsoventrally flattened, oval; analogous to tree leaf Segmented No Yes with segments called proglottids No Symmetry bilaterally symmetrical bilaterally symmetrical bilaterally symmetrical length from microscopic to nearly 1 m long Few mm to serval meters Few cm to 9 cm Head end Suckers & hooks absent. Well-developed buccal cavity Suckers generally with hooks Suckers with no hooks Alimentary Canal Present; Complete with both mouth and an_s Absent Incomplete; no an_s Body Cavity Present (pseudocoeloms) Absent
  • 2. Absent Sexes Mostly dioecious hermaphroditic Hermaphroditic except Schisto Feature Nematodes (roundworms) Cestodes (tapeworms) trematodes (flukes) Shape thread-like, cylindrical bodies; elongate, tapered at both ends Elongated, flat, ribbon like body Dorsoventrally flattened, oval; analogous to tree leaf Segmented No Yes with segments called proglottids No Symmetry bilaterally symmetrical bilaterally symmetrical bilaterally symmetrical length from microscopic to nearly 1 m long Few mm to serval meters Few cm to 9 cm Head end Suckers & hooks absent. Well-developed buccal cavity Suckers generally with hooks Suckers with no hooks Alimentary Canal Present; Complete with both mouth and an_s Absent Incomplete; no an_s Body Cavity Present (pseudocoeloms) Absent