Iyalin Euglenaceae rukuni ne na taxonomic na kwayoyin halitta guda daya da aka sani da euglenoids ko euglenids. Wadannan kwayoyin halitta suna siffanta su da tsayin daka ko siffa mai siffa, wanda galibi ana rufe su a cikin wani nau'in furotin mai sassauƙa da ake kira pellicle. Suna da tuta guda ɗaya, wadda suke amfani da ita don ciyar da kansu ta hanyar muhallinsu, kuma ana samun su a wurare daban-daban na ruwa, ciki har da ruwa mai tsabta da ruwa. Wasu euglenoids su ne autotrophic, ma'ana suna iya samar da abincinsu ta hanyar photosynthesis, yayin da wasu kuma heterotrophic, ma'ana suna cinye wasu kwayoyin halitta don ciyarwa.