Kalmar “genus” tana nufin matsayi na haraji da ake amfani da shi wajen rarrabuwar halittu, wanda ke sama da matakin jinsi kuma ƙasa da matakin iyali. roughly spherical-shaped bacterium.Saboda haka, "genus coccus" na nufin rukunin kwayoyin cuta masu kamanceceniya da siffa mai siffar zobe ko kuma kusan siffa. Wasu misalan kwayoyin cuta da ke cikin halittar Coccus sun hada da Streptococcus, Staphylococcus, da Micrococcus.