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

alternative ancient animal annelid background belttype biology black blood bloodsucker bloodsucking care class closed comprise dangerous detoxification disease disgust doctor earthworms education glass healing health hematophagia heparin hermaphrodite hirudotherapy hospital illness invertebrate leech leeching medical medicinal medicine nature parasite physic pot research ringworms science segmented skin stained subclass sucker sucking therapy water wet worm