Thalassobathia pelagica

Thalassobathia pelagica is a species of fish in the family Bythitidae (viviparous brotulas). It is sometimes referred to by the common name pelagic brotula.

Description
Thalassobathia pelagica has a maximum length of 22.1 cm. It has 72–79 dorsal soft rays, 58–65 anal soft rays and 22–29 pectoral soft rays. It has 7 branchiostegal rays and its head and body are compressed.

Habitat
Thalassobathia pelagica is bathypelagic, living at depths of 500 - 1000 m in the Atlantic Ocean. Two specimens have been collected between Iceland and Ireland, and one from the Gulf of Guinea. It has also been reported from Greenland and Iceland. A specimen from the Bering Sea has uncertain identification as this species.

Behaviour
Thalassobathia pelagica lives in close association with the sea jelly Stygiomedusa gigantea.