Hirudo verbana References Hirudo verbana annelid Ask Anything Homework Help Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: medicinal leech(phylum Annelida), particularly Hirudo medicinalis, H. verbana, and H. orientalis, once used in the treatment of human diseases and used at present as a source of anticoagulants following certain surgical procedures. See leeching. Read More(phylum Annelida), particularly Hirudo medicinalis, H. verbana, and H. orientalis, once used in the treatment of human diseases and used at present as a source of anticoagulants following certain surgical procedures. See leeching. Read More