Question 1

How do you say Tamisiocaris?

Accepted Answer

Tamisiocaris is pronounced tah-MEE-zee-oh-KAR-iss. Break it into four chunks: tah, then MEE, then zee-oh, then KAR-iss. The stress lands on the second syllable, MEE, so let that one be the loudest. A good memory trick is to say 'tah-MEE-zee-oh-KAR-iss' as if you are counting a slow rhythm: tah-MEE-zee-oh-KAR-iss. Once you have it, it is actually a very satisfying word to say out loud.

Question 2

What does Tamisiocaris mean?

Accepted Answer

The name Tamisiocaris combines two ancient root words. The first part, tamisi, comes from Latin and means sieve or strainer, which refers to the comb-like spines on the animal's frontal appendages that it used to filter food from the water. The second part, caris, comes from Greek and means shrimp or shrimp-like creature. Put together, the name roughly means 'sieve shrimp,' which is a perfect description of a small radiodont that filtered its meals from the Cambrian sea.

Question 3

What did Tamisiocaris eat?

Accepted Answer

Tamisiocaris was a filter feeder, which means it did not hunt prey at all. Instead, it used its specially adapted frontal appendages, covered in densely packed comb-like spines, to sweep through the water and trap microscopic plankton. The collected food was then guided toward its mouth. This feeding strategy is remarkably similar to how modern baleen whales eat, even though Tamisiocaris lived 514 million years ago and was only about the size of a large ruler.

Question 4

How big was Tamisiocaris?

Accepted Answer

Tamisiocaris measured between 22.8 and 33.6 centimeters long, which is roughly 9 to 13 inches, about the length of a large school ruler or a small hardcover book. For a Cambrian animal, that was actually a decent size, but it was nowhere near as large as some of its predatory radiodont relatives. Despite being relatively small, its filter-feeding strategy was sophisticated enough that scientists compare it to the feeding systems of some of the largest animals alive today.

Question 5

Where was Tamisiocaris found?

Accepted Answer

Tamisiocaris fossils were discovered at the Sirius Passet Lagerstatte in northern Greenland. Sirius Passet is one of the most important fossil sites in the world for Cambrian soft-bodied animals, because its unusual preservation conditions allow delicate structures like appendage spines to survive as fossils. Finding a remote site like this deep in the Arctic takes serious scientific expeditions, and the fossils collected there have produced some of the biggest surprises in early animal evolution research.

Question 6

Is Tamisiocaris related to Anomalocaris?

Accepted Answer

Yes, they are relatives within the same broad group called radiodonts. Both animals had distinctive frontal appendages near the mouth that they used for feeding, which is the defining feature of radiodonts. However, Anomalocaris used its clawed appendages to catch and crush prey, while Tamisiocaris evolved its appendages into delicate filtering combs for sieving plankton. They are a bit like cousins with completely opposite table manners: one was a ferocious predator and the other was a gentle plankton scooper.

Question 7

When did Tamisiocaris live?

Accepted Answer

Tamisiocaris lived approximately 514 million years ago during the Cambrian period. This was during a time often called the Cambrian Explosion, when complex animal life on Earth was rapidly diversifying and experimenting with new body plans and ecological strategies for the very first time. The oceans of this period looked nothing like today's seas: there were no fish, no sharks, no whales, and no coral reefs as we know them. Tamisiocaris was one of the larger and more sophisticated animals in an alien-looking underwater world.

Question 8

Why is Tamisiocaris such a big deal to scientists?

Accepted Answer

Tamisiocaris is scientifically famous because it is one of the oldest known examples of suspension feeding in the animal kingdom. Before its appendage structure was fully analyzed in 2014 by Jakob Vinther and his team, scientists did not realize that the ecological strategy of large filter feeding stretched back this far in evolutionary history. The discovery showed that the same feeding approach independently evolved in baleen whales, whale sharks, and manta rays much later was already being used more than half a billion years ago, which tells scientists a lot about how life solves problems in repeating patterns across time.

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