Original: It is a bathypelagic krill that lives in deep waters below 1,000 m. It is distinguished from the Euphausiidae by several morphological features, the most apparent being that they are not bioluminescent and that their first pair of pleopods is not modified as copulatory tool organs.
Simplified: It is a bathypelagic krill that lives in deep waters below 1,000 m. It is distinguished from the Euphausiidae by several morphological features. The features most easily used to tell it apart are  that the animals  are not bioluminescent and that their first pair of pleopods is not modified as copulatory tool organs.