Kalmar "Oniscidae" tana nufin dangin crustaceans da aka fi sani da woodlice, shuka kwari, ko kwarorin kwaya. Waɗannan ƙananan arthropods sune isopods na ƙasa waɗanda ke cikin tsari Isopoda. Ana siffanta su ta hanyar daɗaɗɗen su, ɓangarorin jikinsu da kuma ikon mirgine cikin ƙwallon a matsayin tsarin tsaro. Oniscidae dangi ne daban-daban, wanda ya ƙunshi nau'ikan nau'ikan nau'ikan nau'ikan da ake samu a wurare daban-daban a duniya. Wadannan kwayoyin halitta suna taka muhimmiyar rawa a cikin muhalli, kamar lalata kwayoyin halitta da ba da gudummawa ga hawan keke na gina jiki a cikin halittu.