Science Daily article. Isn’t it cute?

“Biologists all over the world have been eagerly awaiting the results of the genetic analysis of one of the world’s smallest known species, hereafter called the protozoan, from a little lake 30 kilometer south of Oslo in Norway.
When researchers from the University of Oslo, Norway compared its genes with all other known species in the world, they saw that the protozoan did not fit on any of the main branches of the tree of life. The protozoan is not a fungus, alga, parasite, plant or animal.
“We have found an unknown branch of the tree of life that lives in this lake. It is unique! So far we know of no other group of organisms that descend from closer to the roots of the tree of life than this species. It can be used as a telescope into the primordial micro-cosmos,” says an enthusiastic associate professor, Kamran Shalchian-Tabrizi, head of the Microbial Evolution Research Group (MERG) at the University of Oslo…
…The tree of life can be divided into organisms with one or two flagella. Flagella are important when it comes to a cell’s ability to move. Just like all other mammals, human sperm cells have only one flagellum. Therefore, humankind belongs to the same single flagellum group as fungi and amoebae.
On the other hand it is believed that our distant relatives from the family branches of plants, algae and excavates (single-celled parasites) originally had two flagella.
The protozoan from Ås has four flagella. The family it belongs to is somewhere between excavates, the oldest group with two flagella, and some amoebae, which is the oldest group with only one flagellum.
“Were we to reconstruct the oldest, eukaryote cell in the world, we believe it would resemble our species. To calculate how much our species has changed since primordial times, we have to compare its genes with its nearest relatives, amoebae and excavates,” says Shalchian-Tabrizi.
The protozoan is not easy to spot. It lives down in the sludge at the bottom of a lake.
It is 30 to 50 micrometres long and can only be seen with a microscope. When Professor Dag Klaveness of MERG wants to catch the protozoan he sticks a pipe down into the lakebed, removes a column of sludge and pours a bile green algae mixture over it.
The algae are such tempting morsels for the small protozoa that they swim up.
“We can then pick them out, one by one, with a pipette,” says Klaveness.”