Nebaliopsis typica is a species of leptostracan crustacean, the only species in the genus Nebaliopsis. It is exceptionally large for a leptostracan, at up to 40 millimetres (1.6 in) in length, compared to 5–15 mm (0.2–0.6 in) for the other species. It is also the only species not to brood its eggs, but instead lays them directly into the water; correspondingly, there is no sexual dimorphism in Nebaliopsis.