Ellipnion

Hérouard, 1902

8 species

Body ovoid, narrowing anteriorly. Mouth subterminal. 10 tentacles. Lateral tube feet along entire body. Dorsal papillae only at anterior end, often asymmetric. Calcareous deposits simple pointed rods and C-shaped deposits. (Mortensen, 1927)

Dorsal papillae anteriorly placed, usually forming a velum. Deposits consisting of rods and C-s. Calcareous ring consisting of 5 isolated pieces, each with 4 pairs of arms. In Ellipnion kumai, an additional unpaired arm is present on each piece. (Hansen, 1975)