Question

Differentiate between Platyhelminthes, Nematoda and Annelida. (At least 4 points)

Answer 1

Platyhelminthes consists of flat worms. They are dorsoventrally flattened. Have a gastrovascular cavity or no digestive system. No segments. Example) Planerian

Nematoda is an unsegmented pseudocoelomate. No circulatory system. Consists of Roundworms.

Annelia consists of segmented worms. They have a closed circulatory system and are coelomates. Consists of earthworms, leeches.

Answer 2

Platyhelminthes Nematodes Annelida

Flat worms. Round worms. Segmented worms

No digestive tract. No circulatory systems. More complex worm

Not parasitic. Parasitic. Some are parasitic

(Leech)while some

Aren't (earthworm)

Aceolumate. Psuedoceolumate. Ceolumate