Rotifer Floscularia ringens feeding. Its rapidly beating cilia (hair-like structures) bring water that contains food to the rotifer. The “wheel animacules” were first described by Leeuwenhoek (ca.1702); when their cilia beat, they look like they have two wheels spinning on top. They live in reddish-brown tubes made of spherical “bricks.” Differential interference contrast microscopy. Charles Krebs, Issaquah, WA, USA.
An extreme close-up of a type of rotifer known as Floscularia ringens has won first prize in the 2011 Olympus BioScapes Digital Imaging Competition, which showcases photos and movies of life science subjects. The image was the top selection out of more than 2,000 entries in this year’s contest — and it earned the photographer, Charles Krebs, $5,000 worth of Olympus imaging equipment.