DR OLIVER SKIBBE / SCIENCE PHOTO LIBRARY DR OLIVER SKIBBE / SCIENCE PHOTO LIBRARY
Volvox algal cells. Light microscopy footage of a close-up overhead view of the cells of a colony of the freshwater green alga Volvox globator. The cells are connected by thin strands of cytoplasm, and each cell has a green chloroplast with a red eyespot and two long flagella used for locomotion. Several cells are dividing. The focus in the clip changes to show the flagella pressed up against the microscope cover-slip. The colony is a hollow sphere made up from thousands of cells arranged in a single layer. The diameter of the somatic (vegetative) cells is less than 10 micrometres. A colony can grow to more than 1 millimetre in diameter.
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