leech on the glass. bloodsucking . subclass of ringworms from the belt-type class. hirudotherapy

aid alternative ancient animal annelid annelida background belttype black blood bloodsucking care class clitellum closed dangerous detoxification disease disgust doctor earthworms fluke glass healing health hematophagia hemolymph hermaphrodite hirudinea hirudo hirudotherapy invertebrate jar leech leeching medical medicinal medicine microbiology nature parasite parasitic physic relief ringworms science segmented skin subclass sucker suction therapy water wet worm