FLATWORMS OR PLATYHELMINTHES, Their body is soft and flat., Most are parasites., Tapeworms., Parasites have scolex with hooks and suckers., Some are free-living, like planaria, Asexual reproduction by fragmentation, Sexual reproduction: hermaphrodites, internal fertilization or self-fertilization (parasites) and oviparous., NEMATODES OR ROUNDWORMS, Thin, soft and cylindrical body with pointed ends., Most are free-living but some are parasites like pinworms., Intestinal worms or pinworms., Anisakis is and example of parasitic worm of this group., Trichinosis is an example of disease caused by a parasitic worm of this froup., ANNELIDS OR SEGMENTED WORMS, Long, soft and cylindrical body divided into rings called metameres., They move by using rigid, hair-like structures called setae., Some are parasites; others free-living., Leeches which are parasites that feed on blood of other animals., Marine worms which are free-living. Gills.Many setae., Earthworms which are free-living and feed on organic matter in the soil. Cutaneous respiration.., Setae..
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