1gusano platelminto masculino
- The initial studies involved little flatworms called planaria that have a very primitive nervous system.
- Planarians are free-living flatworms, and have a much simpler life history.
- All the ponds hosted parasitic flatworms called trematodes.
- The cestodes, or tapeworms, differ in a number of ways from other flatworms.
- Among the earliest hunters, flatworms were simple but effective killing machines.