From tarantula to black widow-spider sometimes forms a weird form, but there is no current species in one part of the body: the tail. But 100 million years ago, it was clear that there were still such attachments, and amber fossils in Myanmar are now being recorded. In the Cretaceous fossil resin, the researchers found small crawling specimens with all the characteristics of web spiders, with a so-called flagella-tail on the hips.
Webspiders are a very successful evolutionary model: they have spread to more than 47,000 species that can enter many different habitats around the world. Their most important feature is the spider glands, which use them to produce silk. They use this fascinating material for a variety of purposes, including the construction of various forms of nets or wrapping their nets.
There is already evidence that today's spider ancestors have a tail, similar to the scourge that is still found today. This may be more than 300 million years of arthropod fossils, the tail is suspected to be similar to a spider, but still without a sphincter. The current research results show that once the tail does belong to the anatomy of the original web spider, and at least in the Cretaceous period, this physique is represented.
These findings have a total of four specimens stored in amber. About 100 million years ago, Baumhaz captured a creature about 2.5 mm in size with a 3 mm long tail. Research teams from China and Germany, in the United States and the United Kingdom, reported that these creatures have all the characteristics of today's spiders: they have grippers, and the cooperation with sperm, especially the spine plate produced by silk, is transferred to women. Touch the male sex organ. abdomen. According to the researchers, they are similar to today's member spiders (mesothelioma). These are the most primitive known life spiders.
The current name of the Cretaceous Spider Researcher Chimerarachneyingi gives a mixture of more than one animal part after the chimerism in Greek mythology. You suspect that these spiders are either primitive spiders that represent or belong to a group of extinct spiders, which is very close to the origin of today's spiders.
But what is the purpose of the tail? Researchers say this may be a sensory organ. "These types of accessories are usually antennas - they can sense the environment," explains Paul Selden, co-author of the University of Kansas Lawrence. Researchers can only speculate about the lifestyle of spiders and tails. She is caught by resin and may live in bark or moss.
"We don't know if she is building a net," Selden said. "Spiders use their silk for many different purposes - wrapping plaques, lining caves or leaving only traces. I don't think Chimerarachneyingi has built a net that extends into the bushes. But like all spiders, she is of course A carnivore looking for insects," the researchers said.
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