Secrets of evolution. Scientists have figured out where the octopus has a shell, like a nautilus

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 Secrets of evolution: Scientists have figured out how octopuses get a shell like a nautilus

A new study suggests that one species of octopus turned off the main path of evolution and developed a shell for eggs.

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A team of Japanese scientists led by Masa-aki Yoshida and Davin Setiamarga sequenced the species' genome to understand how argonauts adapted to the ocean and acquired their eggshell-like shell. It turned out that these octopuses have long lost the genetic code that produces shells in his ancestors and relatives.

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This species of octopus lives in tropical and subtropical open seas. Female large argonauts possess a coiled egg shell to protect them. The egg case itself resembles the shell of a pearl nautilus, which, by the way, is a distant relative of this species of octopus.

During the study, scientists found that the shell of a nautilus and an egg case of argonauts are formed as a result of the secretion of proteins, but they differ in different ways. formed and look under a microscope.

By examining the Argonaut genome, scientists have found genes that code for egg shell protein, but most of them were not used to form egg shells. The researchers suggest that the distant ancestors of these octopuses actually had shells, but they did not turn into shells for eggs.

According to Yoshida and Setiamarg, at some point, the argonauts apparently deviated from the general evolutionary scenario of the species and lost the ability to form shells. The researchers note that their findings suggest that cephalopods do not actually necessarily show distinct genome evolution.