that interbreeding, prolonged periods of isolation, genetic drift and other processes were habitual in the Middle Pleistocene in Europe is gaining momentum, while at the same time linear hypotheses such as “accretion ”Are losing ground. “The appearance of the classic Neanderthals in the Late Pleistocene is a question by no means finally settled. There remain many open questions, and the Montmaurin-La Niche mandible now joins the list of X-files ”, concludes Bermúdez de Castro Insects comprise the most diverse group of animals with roughly a million described species – about three-quarters of the total species currently living on Earth. One of the main hypotheses that explains this wide diversification is the acquisition of the ability to fly thanks to

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the development of the wing long before any vertebrates,  Portugal WhatsApp Number List approximately 350 million years ago. But despite the importance that the development of this important structure has had for life on earth, the evolutionary origin of the insect wing is still an unsolved mystery. Now, researchers from the Autonomous University of Madrid (UAM) have discovered that the origin of the fly’s wing could be dual. “The wing of the fly would come from the union of two different cell groups, one from the leg and the other from more dorsal regions, which would later mix to form a movable wing,” says Carlos Estella, Professor of Molecular Biology at the UAM. , director of the investigation. To arrive at these results – published in the journal Current Biology – the researchers took as

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a model the fruit fly, or Drosophila melanogaster , and studied the specification and origin of the wing and leg primordia. Specifically, they analyzed the regulatory sequences that direct the expression of the paw ( Distalless, Dll ) and wing ( snail, sna ) identity genes . “These results, in sum, indicate that after more than 100 years of debate between the paranotal and gill theories of the origin of the wing of insects, it is likely that both are partially correct”, concludes Estella. Two evolutionary theories The numerous hypotheses that have tried to explain the origin of the insect wing can be grouped into two major theories. The first is the paranotal theory. It proposes that the insect wing is a de novo invention , originating from lateral

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