1) Deep-sea denizen 2) Fish 3) Malacopterygian 4) Soft-finned fish 
Lanternfishes (or myctophids, from the Greek mykter, `nose` and ophis, `serpent`) are small mesopelagic fish of the large family Myctophidae. One of two families in the order Myctophiformes, the Myctophidae are represented by 246 species in 33 genera, and are found in oceans worldwide. They are aptly named after their conspicuous use of biolum...
[n] - small fish having rows of luminous organs along each side
noun small fish having rows of luminous organs along each side; some surface at night