Flatworm

A flatworm (ヒラムシ, Hiramushi) is a type of deep sea creature only found in. This game marks the first appearance of Flatworms.

In New Leaf
Upon donating a Flatworm to the Museum, it can be found in the large pool in the first room of the Ocean exhibit, along with many other species of deep sea creatures. It is found near the enterance of the exhibit. The exhibit has this to say about the Flatworm:

"Flatworms are flat creatures, and while some types look like Sea Slugs, they have little else in common. Some types are venomous and produce a poison similar to the kind blowfish are famous for. Flatworms are hermaphrodites and mate by fighting to determine the loser, who then bears the eggs."