phylum or class of elongated wormlike parasites that live in the intestines of vertebrates: spiny-headed worms

soil-inhabiting saprophytes and disease-producing plant and animal parasites

phylum or class of elongated wormlike parasites that live in the intestines of vertebrates: spiny-headed worms

phylum or class of elongated wormlike parasites that live in the intestines of vertebrates: spiny-headed worms

phylum or class of elongated wormlike parasites that live in the intestines of vertebrates: spiny-headed worms

phylum or class of elongated wormlike parasites that live in the intestines of vertebrates: spiny-headed worms

phylum or class of elongated wormlike parasites that live in the intestines of vertebrates: spiny-headed worms

phylum or class of elongated wormlike parasites that live in the intestines of vertebrates: spiny-headed worms

phylum or class of elongated wormlike parasites that live in the intestines of vertebrates: spiny-headed worms

phylum or class of elongated wormlike parasites that live in the intestines of vertebrates: spiny-headed worms