Body long and oval. Antennular flagellum (a1) with many segments, antennal flagellum (a2) with about 30 segments. Antennal peduncle with six segments (five segments obvious).
Pleopods 1-2 similar. Pleopod 3 with broad and flat basis.
Hind margin of pleotelson with four pairs of spines.
Uropod with endopod longer than pleotelson; bot endopod and exopod with spines.
Bright light with brown spots
Length 27-33 mm.
Epizoic on fish, also free-swimming.
Down to 1500 m.
Distribution in the North Sea
All North Sea (also in Kattegat).
N Atlantic Ocean, including the Mediterranean Sea.
[Nierstrasz and Schuurmans Stekhoven, 1930]