Kalmar "Carapidae" tana nufin dangin kifayen ruwa da aka fi sani da lu'u-lu'u ko ɓangarorin teku. Waɗannan kifaye suna da tsayin jiki, da hancin hanci, da rashin ƙoƙon ƙashin ƙugu. An san su da salon rayuwarsu na musamman, inda suke zama a matsayin ƙwaya a cikin jikin sauran dabbobin ruwa, irin su cucumbers na teku, kifin taurari, da urchins na teku. Sunan "Carapidae" ya fito ne daga kalmar Helenanci "karapos," ma'ana "kaguwa," da "idae," wani kari da aka saba amfani dashi don nuna dangin kwayoyin halitta a cikin haraji.