Antenna 1 shorter than antenna 2; flagellum article 1 slightly longer than article 2. Antenna 2 between 40 to 60% of body length; calceoli present. Eyes large, reniform. Lateral cephalic lobes quadrate. Maxilliped palp 4-articulate; inner plate poorly developed, not reaching half length of outer plate.
Gnathopod 1 subchelate; coxa large, about as long as coxa 2, subrectangular with concave anterior margin; ischium short; carpus short, of subequal length to propodus; propodus margins tapering, palm transverse. Gnathopod 2 subchelate; carpus almost twice as long as propodus; dactylus minute. Pereopods 3 and 4 propodus with blunt, locking robust setae at posterodistal corner. Pereopod 5 coxa equilobate; basis about as long as broad. Coxa 6 equilobate.
Epimeron 1 anterodistal corner producing small, up-turned spine; epimeron 3 posterodistal corner produced, forming a large upturned spine. Urosomite 1 with dorsal depression, not dorsally carinate. Uropods 1 and 2 rami subequal; uropod 2 inner ramus with marginal constriction(s); uropod 3 outer ramus 2-articulate, article 2 short, rami subequal with inner ramus not extending past article 1 of outer ramus. Telson distinctly longer than broad, deeply cleft.
Female (sexually dimorphic characters): Antenna 2 less than 40% of body length.
31–44 mm. This is one of the largest of the Anonyx species.
North Norway; Faroe Islands; Arctic Seas.