Thalassobathia pelagica is a species of fish in the family Bythitidae (viviparous brotulas). It is sometimes referred to by the common name pelagic brotula.
Thalassobathia pelagica has a maximum length of . It has 72âÂÂ79 dorsal soft rays, 58âÂÂ65 anal soft rays and 22âÂÂ29 pectoral soft rays. It has 7 branchiostegal rays and its head and body are compressed.
Thalassobathia pelagica is bathypelagic, living at depths of 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.
Thalassobathia pelagica lives in close association with the sea jelly Stygiomedusa gigantea.