The Social Amoeba

The Ultimate Flash Mob.

Dictyostelium discoideum (or ‘Dictyo’ for short) is the favorite of biologists studying social behavior and cooperation.

While most of our blobs are “acellular” (one big puddle), Dictyo is “cellular.” They start as thousands of tiny, independent hunters, but their story gets wild when the food runs out.

The Aggregation Signal

When a Dictyo cell starts to starve, it screams for help. It releases a chemical called cAMP (cyclic Adenosine Monophosphate). Nearby cells hear the signal and start moving toward the caller, releasing their own cAMP as they go.

Within minutes, thousands of cells create a “spiral” of movement, eventually piling into a single, visible mass.

The Slug Phase: A Biological Miracle

This mass of cells becomes a Slug. The slug has a front and a back. The front cells are the “navigators”—they are sensitive to light and heat. They lead the entire colony to a better environment.

Micro-Farming

Research has shown that some Dictyostelium colonies are actually microscopic farmers. They don’t just eat all the bacteria they find; they save some of it, carry it in their bodies, and “seed” it in their new location to ensure they have food for the next generation.

Why keep them?

Dictyo is for the Keeper who wants to watch the very origins of multicellular life. They aren’t as “bright” as the yellow Physarum, but their social dynamics are unmatched.