Argonauta Argo is a different kind of sea creature. Females keep their partner's sperm-filled limb inside of them when they mate. She starts making a bag.
She uses the tips of her arms to make a mineral formula out of paper. The home of more than 40,000 embryos can be found in the construction. The argonaut octopus crawls inside its shell-like purse, traps some air bubbles inside, and bobs just beneath the surface of water in warm oceans around the world.
The egg holder is so similar to the hard shells of the Nautiloids that it has been dubbed the "Paper Nautilus." The data shows that the genes that made the embryo armor were independently evolved by the octopus.
A researcher at the National Institute of Technology, Wakayama College in Japan detailed the new data in the journal Genome Biology and Evolution.
The chambered, pearly shell is similar to the one worn by the nautilus, a shell that is still used today. Over millions of years of evolution, soft-bodied cephalopods like octopuses, squids and cuttlefish were able to shrink their outer shell and adapt to their individual habitats. When you think of an animal, you think of something squishy.
The scientific debate about whether or not an animal can lose a nautilus-shell-like structure during the course of evolution has been spurred by the argonaut. The egg case was thought to be formed by archaic genes from the mollusk era. The data from the Sea of Japan suggested that it was not true. Scientists found that argonauts have the same genes as their nautilus cousins and that they need to build shells. They use completely different genes than the nautilus do. The shell-like egg case isn't an evolution of the ancestral shell but a new purpose.
There are many different ways in which animals can make biomineralized structures, according to a researcher who was not involved in the study. It shows that evolution can take many different paths.
There is a debate over whether the egg case should be called a shell.
While holding up two structures in front of his face during a video call, Dr. Setiamarga said, "Look at them" It is very brittle and they look the same. This is similar to crackers that you put cheese on.
It shouldn't be called a shell because there's a major difference in how it's constructed. Other mollusks make their shells with mantle tissue that is produced by a glands.
He wants people to stop calling it a shell and start calling it something else. It drives me crazy that people call them paper nautilus.
The new genome sequence may help scientists understand how argonauts evolved to be pelagic, or living in open waters, instead of being benthic.
The director of the Oki Marine Biological Station at Shimane said that it fills in some of the gaps between how evolution went from the Nautiloids to the modern octopus.
More research is being done by Dr. Yoshida and Dr. Setiamarga. The evolution of the argonaut can be mapped out with this rearrangement.
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