It's not every day that biologists announce an entirely new branch of life, and this one has been hiding under their noses for years.

It was discovered hiding in a lab sample of marine ciliates scientists had been tending to since collecting them from Croatian waters in 2011. But it wasn't until the ciliates suddenly died that this new, tiny creature, which scientists have named came into view.

"This organism allows us to look into a very ancient chapter of cellular evolution that we previously could reconstruct only indirectly," say protistologists Ivan Čepička and Marek Valt, from Charles University in the Czech Republic, lead authors of the study.

"The cells of are tiny and only slightly motile, and we overlooked them in the ciliate culture for several years… Given that we missed

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