We humans are mammals, but also part of a larger entity in the animal kingdom.
We're double sided. We have a symmetrical body with front and back, head and backside, and the digestive tract in the middle. Most of the animals are duplexes, birds, fish, worms, insects and so on.
Non-bi-animal animals include jellyfish and fungi and microbes.
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The oldest known duplex animal fossil has now been found in Australia. So, a grain-sized creature resembling a worm is perhaps our early ancestor, and almost all other animals. It's named Ikaria wariootia and it lived about 555 million years ago.
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Researchers at the University of California and Museum of Natural History in South Australia have been excavating the Nile Peninsula, Australia, known for its fossils dating back over 550 million years. They date back to the Ediacar era, when the earliest animals of the microbial complexity evolved on Earth.
The creatures of the Ediacar era were strange, multi-headed worms and foot-like wafer-like revelations. Dickinson. The fossils of the Ediacar period can also be found near Finland, in the White Sea region.
At that time, animals did not yet have a protective shell or bone. So there was nothing in their remains that could have been fossilized. On the other hand, the traces and depressions left by these soft-bodied animals have become fossilized and provide information on these creatures as well.
During the Ediacar era, the early animals moved in shallow sea sand and bottom mud in search of food. When the creatures died and the sand petrified, the animals were depressed like a drywall. These are called post-fossils.
these Ikaria wariootian Ancient imprints left by researchers have now been found on Australian rocks. Depressions are rice grain-like traces that an untrained eye would not distinguish from ordinary stone cavities. Among them there are petrified paths, or corridors, which the creatures have blown up in the sand.
The researchers carried out three-dimensional laser scans and important details could be discerned. The depression can be seen in the Gypsum Form of a primitive and very small animal that had a distinct front and rear. They also show grooves like the “v” that indicate some kind of muscle.
“We knew that these types of animals must have been in those days, but we also knew it would be difficult to identify them,” says the doctoral student. Scott Evans University of California news channel CNNA.
The remains of Icaria fossils were found on a bed of rock that was 551 to 560 million years ago. Later evolved duplex creatures are known from this period, the Ediacar period, but Ikaria wariootia is the oldest of them.
After oxygen and food
More than a hundred imprints of creatures were found on the rocks. It is clear from all that one side of the rice grain is larger than the other.
“It means that the animal had a distinct head and back, and this form of body has evolved into a later life spectrum with its heads and tails,” explains Evans The Guardian in the newspaper.
Ikaria with wariootia has already been the mouth, the digestive tract and the anus, and the development of the bipedal body is also linked to the development of the senses. When the animal has a direction of travel and thus a head, it is useful that the body develops some sensory function to detect nutrition and potential hazards.
From the rocky paths, it can be concluded that Ikaria has followed oxygen and food. The rock layers show that Ikaria once avoided digging too deep into the sand of the seabed, where microbial degradation renders the environment oxygen-free and toxic to the animal.
So the creature must have had simple senses, and even though the creature is just a tiny bit of rice in the eyes of the eye, it was once an incomparably complex creature, downright Rolls-Royce of multicellular organisms.
Before the Ediacar era, life on Earth was very simple. It took billions of years for microbes to develop multicellular lifestyles. So they were such small worms, but conscious of their purpose.
Ikaria wariootia is named after the local landmarks and the original language of the Australian Nile Peninsula. Ikara is an aboriginal name for the nearby mountains and a creek called Warioota flows near the site.
A description of the new fossil was published by the US Academy of Sciences PNAS-in leaf.