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.