Some species originally assigned to Hymenocaris were later transferred to Canadaspis, such as Canadaspis perfecta (Hymenocaris perfecta), leaving only Hymenocaris vermicauda.
一些最初被歸類到膜蝦蟲屬的物種後來被重新分類到加拿大蟲屬（英语：Canadaspis）（Canadaspis），例如：Canadaspis perfecta（Hymenocaris perfecta），因此本屬現在只剩下Hymenocaris vermicauda一種。