Atlantic walrus References Images Atlantic walrus mammal Ask Anything Homework Help Also known as: Odobenus rosmarus rosmarus Written by The Information Architects of Encyclopaedia Britannica The Information Architects maintain a master list of the topics included in the corpus of Encyclopædia Britannica, and create and manage the relationships between them. The Information Architects of Encyclopaedia Britannica Britannica AI Ask Anything Learn about this topic in these articles: walrusThere are two subspecies: the Atlantic walrus (Odobenus rosmarus rosmarus) and the Pacific walrus (O. rosmarus divergens). Male Pacific walrus are slightly larger, with longer tusks. Read MoreThere are two subspecies: the Atlantic walrus (Odobenus rosmarus rosmarus) and the Pacific walrus (O. rosmarus divergens). Male Pacific walrus are slightly larger, with longer tusks. Read More