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Volvox (vol-vox) is the iconic colonial volvocid - motile green alga. In this case hundred of cells are embedded in a sphere of common mucus. Each individual cell is tiny, linked to others by fine threads of cytoplasm, has two flagella, and a cup-shaped chloroplast - a bit like a Chlamydomonas cell. There are a number of related genera which form colonies using mucus as a common matrix, but they differ in the numbers of cells involved, how tightly packed they are, and the shape of the colony. This is a detail of the surface of the colony, showing the flagella projecting from beyond the edge of the mucus. Differential interference contrast. |
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