Diatoms. Light micrograph of assorted species of diatom, a group of single-celled algae. Pennate diatoms (at upper right & left and lower right) are symmetrical about a line. The rest are centric diatoms which are symmetrical about a point. A characteristic feature of diatoms is their intric- ately patterned, glass-like cell wall, the frustule. The frustule consists of two halves which fit together like the lid and bottom of a box. It is often decorated with rows of tiny holes, known as striae. Diatoms form an important part of the plankton in the marine and freshwater food chains. These specimens were found in the North Sea. Magnification: x160 at 4x5 inch size.

Photo website with Rights Managed and Royalty Free stock photos, images, illustrations and footage available for download immediately for commercial and editorial uses. Aflo is a leading independent supplier and producer of stock pictures and visual content. Search and find high quality images and video for design, print, web-use and publishing. Buy photos from our extensive collection of model released and property released sports images. Search some of the most beautiful travel and landscape pictures from our own photographers and license from our large collection of content, modern and archive, focusing on Japan. We provide free research. Register for personal account management and for full use of our Stock Photography website and start to download images now.