Everything about Pelomyxa totally explained
Pelomyxa are giant
amoebae, usually 500-800
μm but occasionally up to 5 mm in length. The most notable species is
P. palustris; other described species may be synonyms, or have been moved to the unrelated genus
Chaos. They are found in mud at the bottom of freshwater streams.
Pelomyxa have anywhere from two to several hundred
nuclei. A moving cell is cylindrical in shape, with a single hemispherical
pseudopod at the front and a semipermanent projection called a uroid at the back, which is covered in tiny non-motile
flagella. They consume a wide variety of food, and have many
vacuoles containing whatever particles that happen across, both food such as
diatoms and debris such as sand.
This is one of several genera of amoebae that lack
mitochondria. As such it has been considered as possibly one of the most primitive
eukaryotes, and given its own phylum (Pelobionta or Caryoblastea). However the absence is now known to be secondary. It is grouped with the other amitochondriate genera as the
Archamoebae, which are now placed among the
Amoebozoa.
Further Information
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