Question 1

How do you say Microbrachius?

Accepted Answer

You say it like this: my-kroh-BRAY-kee-us. Break it into four parts and put the stress on the BRAY part in the middle. The my-kroh at the start comes from the Greek word for small, and the BRAY-kee-us at the end comes from the Greek word for arm. Say it a few times fast and it starts to feel natural. A good memory trick is to think: my crow BRAY kee us, like a crow that brays.

Question 2

What does Microbrachius mean?

Accepted Answer

Microbrachius literally means small arms in Ancient Greek. The micro part means small, just like in words we use today such as microscope or microphone. The brachius part comes from brachion, the Greek word for arm, which also shows up in words like brachiosaurus. Scientists named this tiny Devonian fish after its most obvious feature, the stubby little paired appendages sticking out from its armored sides, never imagining those arms would turn out to be one of the most important structures in evolutionary history.

Question 3

Why is Microbrachius so famous?

Accepted Answer

Microbrachius became world-famous in 2014 when scientists announced it was the oldest known vertebrate to have sex. Researchers led by Professor John Long of Flinders University found that male Microbrachius had L-shaped bony claspers and females had matching locking plates, proving these tiny armored fish used internal fertilization to reproduce about 385 million years ago. That pushed the origin of sex in backboned animals back by tens of millions of years. The discovery made headlines around the world and appeared in the journal Nature.

Question 4

How big was Microbrachius?

Accepted Answer

Microbrachius was extraordinarily tiny. Most specimens have a body length of just 2 to 4 centimeters, which is roughly the size of a large grape or a standard shirt button. For comparison, many of its relatives in the placoderm group grew to far larger sizes, but Microbrachius stayed small throughout its existence. Despite its minuscule body, it had a disproportionately large, heavily armored head, which is one of the defining features of antiarch placoderms.

Question 5

Where did Microbrachius live?

Accepted Answer

Microbrachius fossils have been found in Scotland, Belarus, Estonia, and China. During the Devonian Period, around 385 million years ago, these regions were part of or near a large ancient landmass called Euramerica, and much of the land was covered by shallow lakes, rivers, and inland seas. Scotland in particular has produced some of the most important Microbrachius specimens, and the fish likely lived in the warm, shallow freshwater and brackish environments that characterized that part of the ancient world.

Question 6

What did Microbrachius eat?

Accepted Answer

Microbrachius was almost certainly not a predator. Scientists think it was a bottom feeder, sifting through sediment and consuming algae, organic debris, and tiny microorganisms. Its large armored head and short, stout body are not built for chasing prey through open water. This feeding style is similar to some modern bottom-dwelling fish like certain catfish or loaches. The shallow lakes and ancient waterways where Microbrachius lived would have provided plenty of organic material on the lakebed to sustain these tiny armored fish.

Question 7

What kind of animal was Microbrachius exactly?

Accepted Answer

Microbrachius was a placoderm, which means plated skin in Greek, a now-extinct group of armored fish that dominated the world's waters during the Devonian Period. More specifically it was an antiarch placoderm, closely related to a group called bothriolepids. Placoderms were among the first vertebrates to evolve jaws, and they ruled the seas, rivers, and lakes of the Devonian for tens of millions of years before going completely extinct at the end of that period, around 359 million years ago. No placoderms survive today.

Question 8

Did Microbrachius have anything to do with modern animals?

Accepted Answer

Yes, in a very profound way. The discovery that Microbrachius used internal fertilization means that this tiny fish represents the earliest known origin of a reproductive strategy that would eventually lead to the way sharks, reptiles, birds, and mammals reproduce today. Interestingly, vertebrates appear to have lost internal fertilization after Microbrachius and its relatives went extinct, then reinvented it independently multiple times. So while Microbrachius is not a direct ancestor of humans, its biology reveals a key chapter in the long evolutionary story that eventually produced us.

Microbrachius Pronunciation

Microbrachius Picture

What does Microbrachius mean?

Name Roots

Fun Facts

Learn More About Microbrachius

Related Words