Water Yukkuris are a special type of Yukkuri that can survive in water, instead of dissolving. There are very few species that are like this. Recently, a sub-species of yukkuri nicknamed Kantai Yukkuri (yukkuri based off of the characters Kantai Collection) have surfaced. Due to the nature of their existance (being based on characters who are based on ships) it's without a doubt that all are aquatic by nature and do not need to be added to the list.