While nudibranchs themselves are not present in Splatoon, they are featured in many pieces of art at Museum d'Alfonsino. No two shown are exactly alike, but they share two common features, the first being a pair of large appendages similar to rabbit or dog ears. While real-life nudibranchs do have these (called rhinophores), they are often smaller and almost always thinner, looking more like horns or eyestalks than ears. Their other common feature is their eyes; while real nudibranchs have small, very simple eyes, all nudibranchs depicted in Splatoon have large eyes similar to those of jellyfish. However, both of these traits may be a result of artistic license; the other artwork in the museum is already quite stylized.
One piece of art shows an Inkling-like creature with a nudibranch on a leash, suggesting that they are kept as pets. In Inkopolis Square, there is a missing poster for a nudibranch, similar to the style of a missing pet poster. In Inkblot Art Academy, there is a poster of a nudibranch eating with a cross, likely meaning "do not feed the nudibranch".
Gallery[]
Art of a nudibranch at Museum d'Alfonsino.