Platyhelminthes, or flatworm , are carnivorous animals. They eat small animals and other flatworms. They also eat protists and rotifers.
Planarians belong to the class Turbellaria within the phylum Platyhelminthes. They are free-living flatworms known for their regenerative abilities and simple body structure.
The leech (phylum Annelida, of the subclass Hirudinea) is a blood-sucking segmented worm. It is an invertebrate as it does not have a spine.
Porifera (Sponges)Cnidaria (Coelenterates)Flatworms (Platyhelmenthes)Roundworms (Aschelmenthes - Nematode)Segmented worms (Annelids)Mollusks (Soft-Bodied/ hard shelled Animals)Echinoderms (Spiny-Skinned Animals)Arthropods