The oldest human ancestors

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Jian Han, Universitas Northwest, China

In 2017, our family tree got a little higher: the team of international scientists identified well-maintained fossils from the primitive sea creatures they said were the oldest ancestors known from various animals, including humans. Saccornhytus creatures named microscopic after the body shape such as his bag in the early Period of the Cambrian around 540 million years ago. Saccorhytus will only be around one millimeter and will live between sand granules on the seabed. To the naked, fossils, found in Central China, looks like dark spots in limestone. However, under an electron microscope, however, it is possible to see significant details: the creatures are bilaterally symmetrical with a body dominated by a large hole that might be used for food waste and excretations (researchers do not find anal signs.) , The body's body cover might be thin and flexible, indicating that it can move by stretching or making a contract movement. Arranged around the Central Openings are several smaller openings so researchers hypothesize may have evolved into gills.

The researchers believe that Saccorhytus is the earliest specimen known from the animal group called Deuterostomes, which includes Chordate (groups that cover all vertebrates) and echinoderms.

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