Trematodes typically require at least two different hosts to complete their development:
: They typically have flattened, leaf-like, or worm-like bodies ranging from 1 mm to several centimeters in length. trematode
: A tough, continuous outer layer called a syncytial tegument protects them from the host's digestive enzymes and immune system. Trematodes typically require at least two different hosts
: Most are hermaphroditic (monoecious), containing both male and female reproductive systems and capable of self-fertilization. A notable exception is the Schistosoma genus, which has separate male and female sexes. Complex Life Cycle trematode
Schistosomes and Other Trematodes - Medical Microbiology - NCBI
: They possess two muscular suckers—an oral sucker near the mouth and a ventral sucker (acetabulum) on the underside—to anchor themselves to host tissues.