Tapeworms
Tapeworms live in the digestive tract of vertebrates as adults, and often in the bodies of various animals as juveniles. Over a thousand species have been described, and all vertebrate species can be parasitised by at least one species of tapeworm. Tapeworms have both male and female reproductive systems in their bodies, but self-fertilization is rare. During reproduction, the cirrus of one individual connects with that of the other through the genital pore, and then they exchange their spermatozoa (mobile
sperm).
sperm).