 However, unlike its prey "M. ruba", it is not clear whether "D. acuminata" uses the plastids permanently or temporarily.Food vacuoles found in the vacuoles of this primitive genus indicates that organisms in this genus are mixotrophs especially D. norvegica[1].Mixotrophy is the ability of an organism to use different sources of carbon and energy instead of having a single mode of feeding (autotroph or heterotroph).