any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines

any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines

any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines

any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines

any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines

any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines

any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines

any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines

any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines

seed vessel having hooks or prickles