The hooded nudibranch can be up to 10 cm long, 2.5cm wide and 5cm across the expanded oral hood. The hooded nudibranch is a translucent white, yellow, orange or greenish organism. It has a quite noticeable round oral hood for what could be seen as a “head”. Another feature to note, is that they are more gelatinous than a typical sea slug. When the hooded nudibranch is taken out of water it gives off a sweet fruity aroma.