A unicellular organism, also known as a single-celled organism, is an organism that consists of a single cell, unlike a multicellular organism that consists of multiple cells. Organisms fall into two
Valonia ventricosa, a species of alga with a diameter that ranges typically from 1 to 4 centimetres (0.4 to 1.6 in), is among the largest unicellular species
Modern stromatolites in Shark Bay, Western Australia. It can take a century for a stromatolite to grow 5 cm.
A bottom-dwelling community found deep in the European Arctic.
Microsporidia are a group of spore-forming parasitic unicellular fungi. These spores contain an extrusion apparatus that has a coiled polar tube ending in an anchoring disc at the apical part of the s
Xenoma on flatfish caused by Glugea stephani
Dictyocoela diporeiae. A, meront and spore; B, spore wall; C, polar filament
A hyperparasitic microsporidian, Nosema podocotyloidis, a parasite of a digenean which is itself a parasite of a fish.