Vorticella

Identification pending. This frame stays empty until someone who knows this organism can confirm it is the one on the label — the footage below is part of that question, not an answer to it.

Vorticella

A stalk that coils faster than a muscle can, and never uses a muscle.

Watch the stalk, not the bell.

Vorticella has arranged its life around not going anywhere. It fixes itself to a surface, opens the wide end of its body into a rim of beating cilia, and spins a small tornado of water down into its own mouth. Whatever the water was carrying is now lunch. It is a perfectly good living, and it means the animal spends its days at the end of a tether, exposed.

So the tether is the weapon. Running down the inside of the stalk is a helical thread — the spasmoneme — that will collapse when calcium reaches it. It does not need ATP to do this. It does not need muscle, because there is no muscle: the whole contraction is a protein spring letting go. The stalk coils, the bell is snatched backwards out of danger, and the entire event is over in a couple of thousandths of a second.

Then comes the slow part. Re-extending the stalk is the step that actually costs energy, and it takes the better part of a second — an eternity, at this scale. The animal is fast in exactly one direction: away.

You can see the thread in the footage. Whoever filmed it knew what they were pointing at.

In the running

Openly licensed footage filed on Commons under this organism's name. Nobody has chosen which of these should carry the portrait, and nobody has confirmed they all show the same organism as the label. Both are open questions, and neither is answered by us alone.

Choose the one that should carry Vorticella IZ-006 · ~10 min · on Tinkerism →

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