There they find themselves facing a Titanian threadworm. Its common name in the US is threadworm. "Ascaris lumbricoides" and in ascarid parasitoses in general (including threadworm parasitosis). They block the entrance to a threadworm nest and Diane falls asleep. In British usage, however, pinworm refers to "Strongyloides", while "Enterobius" is called threadworm.