Kalmar “Genus Isurus” tana nufin rabe-raben haraji a cikin rabe-raben halittu masu rai. Isurus jinsin sharks ne, wanda aka fi sani da mackerel sharks, na dangin Lamnidae. Sunan Isurus ya samo asali ne daga kalmar Helenanci "isos" ma'ana daidai, da kuma "oura" ma'anar wutsiya, yana nufin madaidaicin caudal na shark. Wasu daga cikin jinsunan da ke cikin jinsin Isurus sun haɗa da babban kifin shark (Isurus oxyrinchus) da shortfin mako shark (Isurus oxyrinchus).