Octopus Shell Download [2021]

Originally I wanted to make this into a necklace, but the shell was just too large so I scrapped the idea. I will revisit it with smaller shells in the future, once I have an opportunity to head to the beach and go looking for some.

She uses the tips of two of her blue-sheened arms to secrete a mineral formula, crafting it into a paper-thin basket shaped like a shell. The construction can grow to nearly a foot in length, becoming the home of more than 40,000 embryos. The argonaut octopus crawls inside its shell-like purse, traps some air bubbles inside, then uses its buoyancy to bob just beneath the surface of water in warm oceans around the world.

Octopus Shell Download

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Glass artist, Josh Fradis, has installed a new underwater garden at WMODA with colorful coral reefs and a shell-collecting octopus. Josh is fascinated by the intelligence of these sentient creatures and was inspired by a scene in the award-winning documentary My Octopus Teacher. In the movie, the octopus disguised itself with shells to escape from its shark predator.

Josh equates the flexibility of the octopus with the fluidity of molten glass. As he forms the marine creature in blown glass, he is constantly challenged by the versatility and unpredictability of his chosen medium. Glass is an extraordinary material. It is made from opaque sand, yet it is transparent. It behaves like a solid material, but it is also a sort of liquid.

New research indicates that a type of octopus appears to have evolved independently to develop something resembling a shell, despite having lost the genetic code that produced actual shells in its ancestors and relatives. The study was presented in a new paper in Genome Biology and Evolution, a journal published by Oxford University Press.

Argonauta argo, also known as the greater argonaut, is a species of octopus that lives in tropical and subtropical open seas. Female argonauts have a protective, spiral, shell-like egg case, which protects the eggs inside.

By sequencing the draft genome of the species a team of researchers from Japan, led by Masa-aki Yoshida and Davin Setiamarga, attempted to reveal the genomic background of argonauts and show how the species adapted to the open ocean and acquired its shell-like egg case. Scientists previously had avoided targeting argonauts because it was difficult to keep the animals in aquaria for research purposes. However, the authors here had access to a location in the Sea of Japan ideal for acquiring fresh samples.

Argonauts (Cephalopoda: Argonautidae) are a group of rarely encountered open-ocean pelagic octopuses with benthic ancestry. Female argonauts inhabit a brittle 'paper nautilus' shell, the role of which has puzzled naturalists for millennia. The primary role attributed to the shell has been as a receptacle for egg deposition and brooding. Our observations of wild argonauts have revealed that the thin calcareous shell also functions as a hydrostatic structure, employed by the female argonaut to precisely control buoyancy at varying depths. Female argonauts use the shell to 'gulp' a measured volume of air at the sea surface, seal off the captured gas using flanged arms and forcefully dive to a depth where the compressed gas buoyancy counteracts body weight. This process allows the female argonaut to attain neutral buoyancy at depth and potentially adjust buoyancy to counter the increased (and significant) weight of eggs during reproductive periods. Evolution of this air-capture strategy enables this negatively buoyant octopus to survive free of the sea floor. This major shift in life mode from benthic to pelagic shows strong evolutionary parallels with the origins of all cephalopods, which attained gas-mediated buoyancy via the closed-chambered shells of the true nautiluses and their relatives.

There are a handful of species in the Argonauta genus, with most experts recognizing four unique species. (Argonaut shells are highly variable, creating a lot of confusion and scientific debate into the exact number of species.)

Naturalists used to think argonauts were like hermit crabs, commandeering the shells of other creatures. Then in the 1830s, a French seamstress-turned-naturalist named Jeanne Villepreux-Power conducted rigorous experiments on argonauts and discovered that females create their own shells by secreting a calcite substance from two elongated tentacles.

After creating her egg case, the female gulps an air bubble at the surface and seals it into the shell with her tentacles. Then she dives down until the weight of the compressed air cancels out the weight of her shell, making her neutrally buoyant in the water column. (Nautiluses, on the other hand, have shells with built-in air chambers.) Then the female argonaut deposits her eggs inside the shell and waits for a male to fertilize them.

Thanks for the article! Found 2 of these amazing little creatures last week beached but alive over at Catalina Island, Southern California. One still inside the shell and one semi-detached. Knew they were some sort of octopus and now we know what kind! We put them back out in the ocean, past the tide surge and hope they made it. Also found a couple of empty shells up on the beach. Fascinating!

Blue-ringed octopuses carry a deadly toxin that has no cure, and it took doctors six hours to stabilize the teen after he was carried by stretcher off the beach. A bite from one of these creatures can kill someone within 30 minutes, according to experts.

When the coconut octopus is threatened, it will retreat into its shell, making it very difficult for predators to get to it. This ability to protect itself in this way has been a key factor in the survival of the species. In addition to providing protection, the shells also serve as a form of camouflage, helping the octopus to blend in with its surroundings and remain hidden from predators.

The coconut octopus is also known for its ability to change color and texture in order to blend in with its surroundings. The coconut octopus is able to change the color of its skin to match the surrounding environment, making it nearly invisible to predators. If you carefully observe octopus for a time you can see this ability at work. They can rapidly change colour and texture as they move from place to place. This ability helps octopus hide from predators.

The ability of the coconut octopus to use tools and solve problems has made it a popular subject of study among scientists and marine biologists. This species has been the subject of numerous research studies, and has been found to have a high level of intelligence and problem-solving skills, similar to that of dolphins and other highly intelligent animals.

It's not hard to find that there are actually two octopus creatures (that is, they have 8-legs, in the Order of Octopoda). One is the Cirrina sub-order of Octopoda--they have a small, internal shell and two fins on their head, and NO ink sack. Here's a deep-water Cirrinothauma, often called the "Dumbo Octopus" for its resemblance to the Disney character.

Then there's the other one--the Argonaut (Argonauta argo), a fabulous creature that also creates a very thin, papery shell that it uses to move up and down in the water column... but only the females do so. They are not attached to the body of the female. But, oddly, they make the shell by extruding it from their body and then holding onto it for the rest of their lives.

So the shell is of the Argonaut, but not part of the Argonaut. They make shells for use as egg-cases. By searching for [ argonaut shell ] I was able to find this lovely image of just the shell.

But then there's the more delicate issue of whether or not an Argonaut is an octopus or not. It behaves a lot like a regular nautilus (it's got that nautilus-looking shell that it hangs onto), but the Argonauta argo is a genuine octopus that just seems like a nautiloid. By comparison, a regular nautilus (e.g., Nautilus belauensis) has a very different body plan. In this image you can see the outside and the inside of an "ordinary" nautilus shell.

A. The Argonauta argo controls its buoyancy by scooping air into its shell while on the surface. With this little bubble of air, it can hover easily in the water column. By contrast, other octopuses linger at the bottom of the sea. They can swim around, but they prefer to hide out on the bottom. The Argonauta defies this with its mid-water behaviors.

B. The little octopus can repair its shell! The shell is large, but has thin walls with just one chamber (not like the chambered nautiluses above). The material of the shell is high in magnesium, but is primarily a kind of calcium carbonate. The biggest surprise to me was learning that if the shell of the paper nautilus is damaged, a female can repair it or can completely rebuild it as needed.

1. You may find more than you bargained for! When I started this research, I thought there was only one such octopus. I was very surprised to learn of the Cirrina sub-order of Octopoda. I then found myself in a rathole making sure the results I was finding were about the Argonauta argo, and not the "classic" nautilus. Be careful when you find a lot of results--be sure the thing you're reading is actually about the target of your search.

With eight sucker lined arms and in some cases a pair of tentacles, a cephalopod can maintain a pretty tight grip. But how a cephalopod maintains that grip differs between squid and octopus. Squid use their suckers primarily for grabbing food. The cup-shaped sucker connects to the squid arm or tentacle via a thin stalk. Once the stiff, circular surface of the sucker comes in contact with the prey, a tug from the stalk decreases the pressure inside the sucker cavity, creating a sticky seal.

An octopus is a bit more dexterous than a squid, and uses its arms for a variety of tasks including walking and handling objects. Upon coming in contact with an object, like a tasty crab or rocky ledge, the sucker surface creates a seal with the object. Trapped within the sucker cavity, the water has nowhere to go as the sucker muscles contract. The muscle contraction causes water pressure within the sucker cavity to drop and the higher pressure of the surrounding open ocean forces the sucker surface against its chosen target, creating a strong hold. Inspired by the strength and suction mechanism of octopus suckers, scientists are using them as models for medical adhesives and attachment in robots. ff782bc1db