蛔虫
His first great publication was a study of parasitic worms, the "Enterozoorum Sive Vermium Intestinalium Historia Naturalis". This is the first publication to describe the "Nematoda". His second, the "Synopsis cui accedunt mantissima duplex et indices locupletissima" was the first work to detail the life cycle of important nematode parasites of humans, such as "Ascaris lumbricoides".