http://en.wikipedia.org/wiki/Protist
Many protists have no hard parts or don't produce resistant spores, and their fossils are extremely rare or unknown, as the apicomplexans,most ciliates,some green algae (the Klebsormidiales),choanoflagellates,oomycetes, brown algae,yellow-green algae,excavates (e.g., euglenids).Some of these have been found preserved in amber (fossilized tree resin) or under unusual conditions.
Many protists have no hard parts or don't produce resistant spores, and their fossils are extremely rare or unknown, as the apicomplexans,most ciliates,some green algae (the Klebsormidiales),choanoflagellates,oomycetes, brown algae,yellow-green algae,excavates (e.g., euglenids).Some of these have been found preserved in amber (fossilized tree resin) or under unusual conditions.
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