- Kingdom: Animalia
- Phylum: Chordata
- Subphylum: Vertebrata
- Superclass: Gnathostomata
- Class: Actinopterygii
- Order: Perciformes
- Family: Gobiidae
- Scientific name: Crystallogobius linearis
- Norwegian: krystallkutling
In contrast to the transparent goby, the crystal goby has no shells. It is transparent too, except for some pigmented spots along the side. It can reach a body length of 5 cm.
It is together with the transparent goby adapted to a pelagic life. When disturbed by divers or other potential threats, it often seeks down to the sea bed. It is easiest seen in the dark, caught in the light of a divers torch. It can be found on any depth from the subtidal zone and down to 80 meters.
It can be found in the Mediterranean and the East-Atlantic Ocean, from Lofoten in Norway to Gibraltar.