Phylum Nematoda — Roundworms
Characteristics
- Body elongate, round in cross section, tapered at ends
- Unsegmented
- Complete gut (separate mouth and anus)
- Blastocoelomate (pseudocoelom)
- Widespread and abundant in all habitats; some parasitic
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Vinegar Eel, Turbatrix aceti, a free-living nematode.
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Ascaris lumbricoides; stained cross-sections of female, male, and through pharynx.
See also labeled photo.
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Dog Hookworm, Ancylostoma caninum, female (stained whole mount)
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Adult female trichina worm, Trichinella spiralis (stained whole mount)
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Encysted larva of trichina worm, Trichinella spiralis, in muscle tissue (Trichinosis); (stained whole mount).
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Whipworm, Trichuris sp., an intestinal parasite; (stained whole mount).
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Phylum Nematomorpha — Horsehair Worms
Characteristics
- Body greatly elongate, thread-like (up to 1 m long), often curled up and folded on itself
- Unsegmented
- Lack functional gut
- Blastocoelomate
- Adults mostly in fresh water; larvae parasitic on insects
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Horsehair Worm, Gordius sp., KY
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