thorny-headed worms, or spiny-headed worms and ascaris under the microscope for education in laboratory.

worms prey egg tissue acanthocephala thorny-head hook host spiny-headed proboscis worm thorny-headed spiny-head pathogenesis laboratory background microscopic damage infection anatomy zoology spiny intestines parasites meat fish parasite environment diagnostics spine medicine health cestoda disease macro care zoological screw flat microscope layer parasitic cell headed acanthocephalan dead isolated acanthocephalans shaped scientific characteristics ascaris education