Class [Mammalia] Linnaeus, 1758 - mammals Order Pinnipedia Illiger, 1811 - seals, sea lions, and walrus see Parvorder Pinnipedia Illiger, 1811 Family Phocidae Gray, 1821 - true seals Genus Leptonychotes Gill, 1872 - Weddell seal Leptonychotes weddelli (Lesson, 1826) - Weddell seal see Leptonychotes weddellii (Lesson, 1826)