Kalmar "caseworm" na iya nufin wasu abubuwa daban-daban, dangane da mahallin. Ga wasu ma’anoni ƙamus masu yuwuwa: Nau'in tsutsa asu: Wasu nau'in ɓangarorin asu suna jujjuya al'amuran kariya a kusa da su da aka yi da siliki da tarkace (kamar rassan ko ganye). Wadannan lokuta ana kiran su da “caseworms,” kuma a wasu lokuta ana kiran tsutsar da “bagworms” ko “casebearers.” Har ila yau, koma ga wani tsiro da ake kira Acacia farnesiana, wanda wani lokaci ake kira "casuarina" ko "kullin allura." Wannan shuka ta fito ne daga Amurka ta Tsakiya da Kudancin Amurka kuma ana amfani da ita a wasu magungunan gargajiya. Wani nau'in naman gwari: A wasu wuraren, "caseworm" na iya komawa ga naman gwari da ake kira Hypomyces. chrysospermus, wanda ke lalata sauran fungi kuma ya samar da abin rufe fuska a kusa da naman gwari. yana da mahimmanci a yi la'akari da mahallin lokacin fassara kalmar.