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

aid alternative ancient animal annelid annelida background belttype bite blood bloodletting bloodsucking care class clitellum closed dangerous disease disgust doctor earthworms glass healing health healthy hematophagia heparin hermaphrodite hirudotherapy invertebrate jar leech leeching medical medicinal medicine nature paraphyletic parasite relief research ringworms science segmented skin slice specimen subclass sucker suction therapy water wet worm