Kalmar "tetrasporangium" suna ne da ke nufin wani tantanin halitta na musamman ko tsari a cikin wasu tsire-tsire da algae masu samar da spores guda hudu ta hanyar meiosis. Wadannan spores na iya haɓaka zuwa gametophytes ko sporophytes, dangane da kwayoyin halitta. Kalmar “tetra-” ta fito ne daga kalmar Helenanci don “huɗu,” yayin da “sporangium” na nufin tsarin da ke samar da spores.
