Kalmar "Genus" tana nufin rarrabuwa taxonomic ga ƙungiyar halittu masu alaƙa waɗanda ke da alaƙa da zuriyarsu. . Ya ƙunshi nau'in sananne guda ɗaya kawai, Euryale ferox, wanda asalinsa ne a kudu maso gabashin Asiya, musamman a Indiya da China. Euryale ferox kuma ana kiranta da fox nut, gorgon nut ko makhana, kuma yana samar da iri masu cin abinci wanda aka yi amfani da su wajen maganin gargajiya da abinci tsawon shekaru aru-aru.