Hatimin Gemu wani nau'in hatimi ne, wanda kuma aka sani da Erignathus barbatus, wanda ke da siffa ta musamman "mai gemu" saboda doguwar fari mai kauri. Sunan kimiyya "Erignathus" yana nufin "bakin teku" a cikin Hellenanci, kuma Hatimin Gemu wani lokaci kuma ana kiransa "bakin teku mai gemu." Ana samun su a yankunan Arctic da kuma yankin Arctic, kuma muhimmin bangare ne na abinci da al'adun 'yan asali a wadannan yankuna.