Evolutionary History
Fossils of arcellinid testate amoebae date back to the Cryogenian period.
Testate amoebae are theorized to be mostly polyphyletic (coming from more than one ancestral type), but testaceafilosea, one group of testate amoebae, are theorized to be made up of one ancestral type (monophyletic). Ancient tests of terrestrial fauna are commonly found in fossilized amber, although an important new study has found mid-Cretaceous testate amoeba (i.e., Diffligia, Cucurbitella) in ancient lake sediments. It is likely that the group has evolved minimally over the course of the Phanerozoic.
Read more about this topic: Arcellinida
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