Kalmar "family Sphyrnidae" tana nufin dangin sharks da aka fi sani da hammerhead sharks. Ana siffanta su da kawuna masu siffar guduma na musamman, waɗanda ake kira cephalofoils. Iyalin Sphyrnidae sun haɗa da nau'in kifin hammerhead guda tara, waɗanda ake samu a cikin ruwan dumi da zafi a duniya.
