In contrast to all other rhizpods, amoebina are devoid of any shell-like structure and are therefore extremely flexible. Nonetheless, in most cases a cell polarity can be observed. Pseudopods are mostly lobopods, rarely filpods. During migration, a clear ecto- and a granular endoplasm can be distinguished in many cases. Amoebina living in habitats which dry out seasonally are able to survive in cysts. Most amoebina, though, live in fresh waters or the sea, feeding on bacteria, protozoa or algae. Some species in the gut of bilaterians.
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