Ommatophoca rossii Ross seals are named for James Clark Ross, the commander of the H.M.S. Erebus , an British exploration ship that entered the Ross sea during a period of Antarctic exploration from 1839 to 1843. Ross seals may reach lengths of 2.5 m, and may weigh as much as 200 kg.
Females are typically larger than males.
Ross seals look different than other seals. They have a smaller, wider head, and a short snout area. They also have a small mouth, and the shortest hair of any seal. Instead of being spotted like other seal species, Ross seals have a streaked pattern on the sides of the neck and down the throat. Sometimes the streaking pattern resembles a mask.