Mantle dome-shaped, slightly compressed dorso-ventrally, 4 cm in length. Fins extend to the entire length of the lateral mantle, consisted of many fleshy supports between which thin membrane presents. Arms rather short, with 2 rows of suckers but change into 4 rows distally. Tentacular club with 8 rows of suckers. A large light organ lies on the viscera in the pallial cavity.