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Trematodes are flattened oval or worm-like animals, usually no more than a few centimetres in length, although species as small as 1 millimetre (0.039 in) (Monogenea) and as large as 7 centimetres (2.8 in) (Fasciolopsis) are known. species that exemplifies the remarkable life history of the trematodes is the bird fluke, Leucochloridium paradoxum. The definitive hosts, in which the parasite reproduces, are various woodland birds, while the hosts in which the parasite multiplies (intermediate host) are various species of snail.
Nematodes. Nematodes, the members of the Phylum: Nematoda, are also known as Round worms. There are about one million nematode species according to some of the estimations, and already there are 28,000 have been described. Annelids have segmented bodies without tapered ends, whereas the bodies of Nematodes are tapered at both ends but not segmented. â¢ Majority of Nematodes are parasitic but not the Annelids. â¢ Body cavity of Annelids is a true coelom while it is a pseudo coelom in Nematodes.