Phylum Platyhelminthes (Flat worms):
1. Platyhelminth worms have slender and flat leaf or strip like body hence called flat worms.
2. Platyhelminthes are triploblastic and acoelomate.
3. Most of them are hermaphrodite or bisexual having both male and female reproductive systems in the same body.
4. Examples: Planaria, Liver fluke, Tapeworm, etc.
Phylum Aschelminthes (Round worms):
1. Aschelminthes have long thread-like or Cylindrical body, hence called round worms.
2. Aschelminthes are triploblastic and pseudocoelomate.
3. They are unisexual with male and female sexes separate. There is sexual dimorphism.
4. Examples: Ascaris (Intestinal worm), Filarial worm, Loa loa (Eye worm), etc.
