Kalmar “genus” tana nufin matsayi na harajin da aka yi amfani da shi a cikin ilimin halitta don rarraba nau’o’in da ke da alaƙa tare bisa la’akari da halayen da suke da su. Wadannan kifayen ana kiransu da suna “minnows” kuma ana samunsu a yankuna daban-daban na duniya, ciki har da Arewacin Amurka, Turai, da Asiya.Saboda haka, “genus Phoxinus” na nufin rukunin kananan kifayen ruwa masu ruwa da tsaki. zuwa gidan Cyprinidae, wanda aka fi sani da "minnows".