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@cephalopodsdaily.bsky.socialOct 16, 2026, 2:31 AM

#OCTOtober

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@cephalopodsdaily.bsky.socialOct 15, 2026, 9:40 PM

The largest octopus species is the Giant Pacific Octopus (Enteroctopus dofleini). The largest individual reportedly had a weight of 272 kg and arm span of 9.6 m, but your typical adult is much smaller.

They are also one of the longer living octopuses, being able to live up to 5 years.

#OCTOtober

A Giant Pacific Octopus (Enteroctopus dofleini) clinging to a large rocks on the poking out of the water. The camera is above the water and you can see the shiny, bumpy surface of the water. The octopus is stretching its arms into the shallow water on the rock. Just behind the rock is a steep drop off of a couple metres. The water as a beautiful blue colour. The octopus is a deep orangish red colour, and it appears to have its papillae raised.A close-up of a giant Pacific octopus (Enteroctopus dofleini) showing longitudinal folds on the body (which look like big, raised wrinkles) and its raised paddle-like papillae. The close up is focused on its head and mantle. The octopus is facing towards the left and is a dark red to reddish orange to orange colour.A juvenile Giant Pacific Octopus (Enteroctopus dofleini) in a plastic container. It is translucent and reddish orange, with dark red chromatophores. It looks squishy and cute.A juvenile Giant Pacific Octopus (Enteroctopus dofleini) crawling on the seafloor. The seafloor is rocky, with the rock being about the size of the octopus (although not as long) and there is a layer of algae covering most of it. The octopus has its mantle deflated and pointing at a shallow upward angle, and the octopus is reaching forward with one arm while the others are pointed out around it. The arms are wavy, with their tips curled. The octopus is a orangish red colour.
@cephalopodsdaily.bsky.socialOct 14, 2026, 8:38 PM

Most octopuses live on the seafloor, but not Japetella diaphana. This gelatinous octopus lives out in the open ocean, floating around.

They don't even lay eggs on the seafloor; instead Japetella mothers carry around their eggs, floating in the bathyal zone where sunlight doesn't reach.

#OCTOtober

A female Japetella diaphana floating in the ocean, carrying eggs and brooding. The octopus is facing away and to the left, and is oriented vertically, with its arms being curved backward (towards camera and to the right). Two arms curved further upwards. In the centre of its arms are a clutch of white eggs. The octopus has a single row of eggs on its arms. The octopus is a peach colour.A Japetella diaphana floating in the ocean. It is oriented horizontally and slightly down. It is covered in orange chromatophores but they are quite small. Its entire body is clear, translucent and gelatinous. Its arms are held together.A close up of a male Japetella diaphana floating in the ocean. It is facing away from the camera. It is oriented vertically, but its arms are going back and are in different directions. You can see the single row of suckers on each arm. It is peach coloured.A Japetella diaphana floating in the ocean. It is gelatinous and transparent, with an orange organ inside its mantle being visible.It is covered in orange chromatophores that are mostly opaque, and you can see through it in the gaps between them. The octopus is oriented vertically with its arms pointed down. Its arms are mostly an opaque orange but they are surrounded by transparent flesh.
@cephalopodsdaily.bsky.socialOct 14, 2026, 4:56 AM

#OCTOtober

@cephalopodsdaily.bsky.socialOct 13, 2026, 6:34 PM

Octopuses are solitary creatures, which is pretty understandable when most species engage in cannibalism.

However, larger Pacific striped octopus are an exception. This undescribed species has been known to live in groups of up to 40 octopuses and mates in a beak-to-beak position.

#OCTOtober

A Larger Pacific striped octopus standing in a tank with two arms with its suckers visible. It is leaning on a plastic tube with two of its arms, and its striped mantle is drooping down, facing the camera. One arm is reaching back behind the mantle and is curled, making it look like the octopus is deep in thought.A Larger Pacific striped octopus partially hiding in a glass container. It is rather small. Its suckers are visible. It is mostly an off white colour.A larger Pacific striped octopus in a tank, leaving a conch shell to grab a shrimp. The octopus is mostly a dark brown with a shade of red or purple, with some sandy brown spots and stripes, especially on the top of its head and mantle. Its mantle narrows at the tip. You can see two rows of suckers on its arms. The shrimp is translucent and yellow.Two larger Pacific striped octopus mating in a beak-to-beak "kissing" position. They are gripping each others faces, and the rest of their arms are curled away. The octopus on the left is lightly coloured, with a sandy beige colour, and the octopus on the right has a dark reddish brown colour. Where their stripes are, they have darker colours, a light brown and a dark red respectively.
@cephalopodsdaily.bsky.socialOct 13, 2026, 4:43 PM

#OCTOtober

@cephalopodsdaily.bsky.socialOct 12, 2026, 3:56 PM

The Southern Sand Octopus (Octopus kaurna) is a lanky octopus that is an expert in burrowing under the sand.

They use their siphon to jet water into the sand to fluidize it, then they start digging and pull themselves in. Then use their long arms to make a hole so they can breathe.

#OCTOtober

A Southern Sand Octopus (Octopus kaurna) burrowing into the sand next to a small sea plant. Its head and prolate spheroid shaped mantle are completely out of the sand, but its arms are all mixed up in the sand. The mantle is partially inflated and light orange. Its head and arms are dark orange. The arms are long and thin, and you can see the double rows of suckers on the arms. The rows of suckers are offset from each other.A Southern Sand Octopus (Octopus kaurna) sitting among small rocks on the sea floor. It has long thin arms that are just messily on the ground, mostly to the right. On arm in front is raised a bit and turned so you can see its double rows on interlocking suckers. The octopus is dark orange and has a thin, teardrop shaped mantle.A Southern Sand Octopus (Octopus kaurna) burrowing into the sand. The photo is taken from behind. The mantle is long and thin, but partly inflated. Most of its arms and head are not visible, partly due to the cloud of sand it is creating. It is mostly orange but the bottom of the mantle is white.A Southern Sand Octopus (Octopus kaurna) sitting on the sea floor. Its lower body appears to be buried but its head, mantle and arms are still mostly above the sand. Its arms are all curled and in a tangled pile next to its head. Its offset double row of suckers are are clearly visible. Its mantle is partially inflated, giving it a shape like a skinny lemon. The octopus is orange except for the bottom of its mantle that is white.
@cephalopodsdaily.bsky.socialOct 11, 2026, 6:11 PM

The big-eye jellyhead (Inopinoteuthis magna), in addition to having a very silly name, is thought to be the largest species of cirrate octopus, a group of octopus with small tendrils called cirri, fins and an internal shell.

One specimen of this species had a total length of 1.7 m.

#OCTOtober

@cephalopodsdaily.bsky.socialOct 10, 2026, 6:37 PM

I just know they'd love hot tubs.

Vulcanoctopus hydrothermalis is a small octopus species that lives around deep sea hydrothermal vents. They can handle the heat though, being able to survive in water up to 91°C. They have a mantle length of less than 6 cm and weigh less than 44 grams.

#OCTOtober

A vulcanoctopus hydrothermalis crawling around a rocky hydrothermal vent. It is pale white and has black eyes. Its arms are curled. There is a sea anemone on the right of the imageA vulcanoctopus hydrothermalis octopus walking on the sandy seafloor. It is pale white and has black eyes.A vulcanoctopus hydrothermalis octopus crawling around a rocky hydrothermal vent. It is pale white and has black eyes. The tips of its arms are curled. There is a sea anemone in the bottom right of the image, and there are several white crabs nearby.A vulcanoctopus hydrothermalis octopus walking on the sandy seafloor. It is pale white and has black eyes.
@cephalopodsdaily.bsky.socialOct 10, 2026, 12:31 AM

Argonauts (genus Argonauta) are a genus of pelagic octopuses like to ride around on jellyfish and salps.

Female argonauts have a "shell" that is actually an egg case that they live in. They are also known as paper nautiluses, although true nautiluses are actually named after them.

#OCTOtober

A female Brown Argonaut (Argonauta hians) riding a red bell jellyfish. The argonaut is sitting on the bell of the jellyfish, and the jellyfish is swimming downward, so the whole thing is upside down. The jellyfish has a dark orange bell and light orange arms. The argonaut has a wavy, spiral egg case that it wears like a shell. The egg case is a off white with black or grey on the outer rim. The argonaut itself is mostly in the egg case but you can see its head and part of its arms sticking out of the egg case. Its arms are sucker side out, and it has a bright orange eye with a round black pupil.A female Noury's Argonaut (Argonauta nouryi) being held by a person in an orange bucket. The octopus is in its "shell". The "shell" is actually an egg case and is white and bumpy. It forms a spiral shape but that is not visible in the photo. The photo is showing the opening where the octopus is. The octopus is a dark red, almost purple, colour with white flesh that just peeks out behind the chromatophores. It has most of its body in the "shell" and its arms are reaching backwards into the shell, exposing the bottom of its arms. The offset two rows of suckers are visible. Its eye is just peeking out from the shell on the left side, at it has a round pupil. On the front right, its siphon is poking out from between its arms and its opening its sort of shaped like a gridiron football, making it look a mouth. If you see the siphon as a mouth, it makes the octopus have a confused, dazed expression.A male Knobbed Argonaut (Argonauta nodosus) riding a jellyfish. It is very small All of its arms are visible, including its hectocotylus. It is translucent, with its mantle, siphon and arms being clear but its head being white and more opaque. Its eye is round and silvery. The jellyfish is pointed to the right, and the argonaut is hanging onto that side. The jelly is transparent and clear with some orange bits visible through the flesh. There are numerous shrimps (or similar looking crustaceans) swimming around. The water is black.A Brown Argonaut (Argonauta hians) riding a translucent jellyfish. The argonaut has a spiral "shell" (actually an egg case) that is it wearing, and its mantle is in the egg case, and its arms are reaching back into the "shell." The shell has a wavy series of edges. The parts of the arms that are exposed have their suckers sticking out. Its mantle is sticking out on the left side. The argonaut has round silvery eyes, its body is white with purple chromatophores, and a beige shell. The jellyfish is clear and has frilly edges. The background is dark.
@cephalopodsdaily.bsky.socialOct 8, 2026, 5:28 PM

Coconut Octopuses (Amphioctopus marginatus) are known to use tools. They will carry around shells in order to deploy them as a mobile shelter. It's nice to have some armour when you're a soft and squishy mollusk

They also are known to sometimes walk around on two limbs. Take that Plato!

#OCTOtober

A Coconut Octopus (Amphioctopus marginatus) sitting in a horizontal bivalve shell on the sea floor, and it is lifting the top half of the shell with one arm. The octopus looks very annoyed, and is staring at the camera. The octopus is a dark brownish red, with light orange on the bottom of its arms and white suckers. The inside of the shell is white, and the outside of the shell has dark red or orange stripes alternating with white ridges.A Coconut Octopus (Amphioctopus marginatus) inside a glass bottle trying to pull in a crab it has caught, but the crab is too big. The octopus has its arms outstretched and grabbing the sides of the bottle. The octopus is off white with some dark brown through its eyes. A lot of its suckers have a light blue tinge. There is a bivalve shell in the bottle. The crab is larger than the octopus. It appears to have a crack in its shell, probably where the octopus bit it. It is facing away from the camera. Its left arms and a small part of its body are pulled into the bottle. It has a mottled batter on its body with some blue at the ends of its arms. The sea floor is sandy.A Coconut Octopus (Amphioctopus marginatus) hiding in a glass jar lying in the seabed. The photo is taken facing the opening. The octopus is sticking its head and the top of its arms out of the jar. The suckers are clearly visible and the octopus is giving puppy dog eyes. The rest of its arms and body is in the jar.A Coconut Octopus (Amphioctopus marginatus trying to leave its collection of shells for a larger shell, which contains another coconut octopus. The first octopus is exposed, and is straddling between the two sets of shells. The original set appears to be three, smallish shells. Two arms are reaching into the new shell. The octopus is purple, with little beige bits breaking up the purple. Its sucked are visible. Its mantle is round. The second octopus is is sitting in two, large mismatched shells. It is quite snug, with its suckers holding on to both shells. It is purple, with a lavender colour around the eyes and white around the suckers.
@cephalopodsdaily.bsky.socialOct 7, 2026, 5:12 PM

Blue-ringed octopuses (genus Hapalochlaena) are the only cephalopod whose venomous bite is potent enough to kill a human.

However, they are docile and won't bite unless provoked or hunting. So keep your distance and don't make them feel threatened or be a crustacean and you'll be safe.

#OCTOtober

A Greater Blue-ringed Octopus (Hapalochlaena lunulata) swimming against a black background. Its mantle is relatively thin and the tip gets much thinner. The end of the mantle is out of focus. The octopus is looking at the camera, and it appears to be moving to the upper right, as most of its arms are trailing in that direction. One arms is going back and another is in front of its face and curving around. The arms have two rows of suckers that are offset. The octopus is yellow with many blue iridescent rings.A photo of a southern blue-ringed octopus (Hapalochlaena maculosa) striking a pose. It is leaning to the left (camera's left), with left arm raised up and with half of it curled, and another one of it's left arms pointing left and with a quarter of it curled. The octopus is a pale brown-yellow with black patches with iridescent blue rings in the centre.A photo of a Blue-lined Octopus (Hapalochlaena fasciata) on the sandy sea floor among sea grass. The octopus appears to be moving, with its arms curled backwards. Its mantle is tear drop shaped or like a milkweed seed pod, gong to a rounded point. It is has its papillae raised. It is a pale yellow colour, with black or dark brown areas. Inside the dark areas, are iridescent blue circles or lines.A Greater Blue-ringed Octopus (Hapalochlaena lunulata) walking. Two arms are touching the ground, but its other arms are tucked close and curled. It is yellow, with some white on the the tip of its mantle, head and centre upper arms. It is covered in iridescent blue rings. It has bumpy skin due to having its papillae raised.
@cephalopodsdaily.bsky.socialOct 6, 2026, 5:22 PM

Mimic Octopuses (Thaumoctopus mimicus) are known for the fact they mimic several different kinds of animals, including sea snakes, flatfish, lionfish, anemones and more. They also seem to choose their disguise based on the predator they are trying to fool.

#OCTOtober

A Mimic Octopus (Thaumoctopus mimicus) sityting on the sea floor. Its mantle is hanging behind it and its arms are holding it up and have the webbing partially inflated. It is facing forwards, towards the camera and its two fleshy horns above each eye are flopping to the left, pushed by the current, making the octopus look rather silly. Its arms are also being pushed left. The sea floor is a grey sand with many small rocks.A Mimic Octopus (Thaumoctopus mimicus) stick out of the sand with an interesting pose. It is some of standing up, with most of its arms going straight down all oriented sucker forward, its mantle hanging behind, and its eyes on top. Its two centre arms, which are on top on the outside in this pose, go out and curve back forming a sort of hood shape. It is unclear why the octopus is in this pose or if it is trying to mimic something. The octopus is brown with some white, and white on the underside of its arms. The arms have two rows of suckers in an offset zig-zag pattern. The sand is greyish.A Mimic Octopus (Thaumoctopus mimicus) sitting in the sand. Its head and mantle are visible, and long "horns" extend from above each eye. Its arms are wavy and extend behind it. It has a white and brown striped pattern.A Mimic Octopus (Thaumoctopus mimicus) going across the sandy seafloor which mimicking a zebra sole. It has body pressed flat against the seafloor, giving it a wide and flat appearance. It has an alternating maroon and pink/white pattern, but mostly maroon. Its arms have alternating stripes of maroon and pink, with its white suckers visible.
@cephalopodsdaily.bsky.socialOct 5, 2026, 8:17 PM

The Māori octopus (Macroctopus maorum) is one of the largest octopus species found in New Zealand and Australian waters.

They also have arms that are long even for a large octopus. They have a max mantle length of 30 cm, but their longest pair of arms can have an arm span of over 3 m!

#OCTOtober

A close up of a Maori Octopus (Macroctopus maorum) focused on its head. It has dark red and bumpy, wrinkly skin skin. One of its eyes is visible and is staring directly at the camera, making it look as if it has a judgmental expression.A Maori octopus (Macroctopus maorum) sitting in among seaweed and extending its long arm at the camera. The seaweed looks like a bush, and its probably attached to a rock that the octopus is sitting on. The octopus is partially concealed, with its head and part of its mantle sticking out. The arm is rather long, although it might look a bit longer from how the camera was set up. It extends from the seaweed, curving down, then curving up while twisting, then going back down and then turning right and then steeply up. The tuckers are clearly visible as they are facing the camera at the end. They are cream coloured, contrasting with the brown of the rest of the octopus. There are two rows of offset suckers, and they are appear to have a brown rim with little fringes. There is not great visibility in the water in the background, but some pillars are visible in the background, possible part of a pier.A Maori octopus (Macroctopus maorum) sitting among some rocks. It is partially between a gap between to rocks, and it is facing into the gap and away from the camera. The octopus has its papillae raised, so its mantle and head look very bumpy. It has yellow eyes. It has a dark purple colour on its mantle and head, with its arms being a mix of purple and white, with white spots.A Maori Octopus (Macroctopus maorum) on the seafloor. It is reaching towards the photographer, with two of them lifted up and curving back, exposing their suckers towards the camera. The two arms take a significant part of the photo, so they make it look like the octopus is trying to block the camera. The octopus is dark orange and has a wrinkly texture with lots of larger bumps. There are fish swimming in the background and the sea floor is covered in medium sized rocks.
@cephalopodsdaily.bsky.socialOct 5, 2026, 2:59 PM

A dumbo octopus for #OCTOtober

@cephalopodsdaily.bsky.socialOct 4, 2026, 10:08 PM

As you probably guessed, the Seven-armed octopus (Haliphron atlanticus) has EIGHT arms!

The males' hectocotylus (specialized mating arm) is curled up in a pouch which, along with their large, gelatinous bodies, makes it look like only have seven arms, hence their common name.

#OCTOtober

A seven-armed octopus (Haliphron atlanticus) swimming while extending its arms. Webbing is between its arms and the tips of the arms are curled outwards. The rest of the octopus is gelatinousA seven-armed octopus (Haliphron atlanticus) swimming while holding a jellyfish in its arms. It's arms are curled away from the jellyfish. The octopus is quite gelatinous and has a white colour, and the jelly fish is golden with short stingers.A view of a seven-armed octopus's (Haliphron atlanticus) mouth. Its arms are spread out, showing the messy row of suckers and webbing. You can see the octopus's eight arms. The octopus is orange with white suckers. It is swimming in a kelp forest.A seven-armed octopus (Haliphron atlanticus) swimming towards the camera while extending its arms. Webbing is between its arms and the tips of the arms are curled outwards. The rest of the octopus is gelatinous. It is pink
@cephalopodsdaily.bsky.socialOct 3, 2026, 7:22 PM

Someone get them some paint and an easel, STAT!

The Brushtip Octopus (Eledone schultzei) has brush-like tendrils at the tips of its arms, hence its common name. The only arm that doesn't get a brush is the hectocotylus, the specialized mating arm that males have.

#OCTOtober

A Brushtip Octopus (Eledone schultzei) crawling around some large rocks. Its arms are spread out and feeling all around. It has reddish orange wrinkly skin.A Brushtip Octopus (Eledone schultzei) in a white plastic container. It is small, so it appears to be a juvenile. It is dark red. Its mantle is leaning back resting on the bottom of the container, while its arms go out into different directions and curve in different waysA Brushtip Octopus (Eledone schultzei) sitting on some rocks. Its arms are held under it except for one arm which is reaching back behind the rock it is sitting on.. It has a light brown colour and bumpy skin.A drawing deplicting the brush like tips of Eledone schultzei's arms from "ROPER AND MANGOLD: REDESCRIPTION AND DESIGNATION OF APHRODOCTOPUS" page 59.. Note the scientific name is listed in the caption is Aphrodoctopus schultzei, a synonym for Eledone schultzei. Caption text: Figure 1. Aphrodoctopus schultzei, holotype, 49 mm mantle length. a-b: Modification of sucker rims into digitate processes on tip of right arm IV. a. Oral view. b. Lateral view. c. Hectocotylized right arm III; ligula length, 4 mm.
@cephalopodsdaily.bsky.socialOct 2, 2026, 5:14 PM

East Pacific Red Octopuses (Octopus rubescens) share their range with the Giant Pacific Octopus (Enteroctopus dofleini) have a similar appearance, so they were originally thought to be young Giant Pacific Octopuses

Even as paralarva, they look very similar, like a little metroid.

#OCTOtober

A juvenile East Pacific Red Octopus (Octopus rubescens) only about 2.5 cm long sitting on something (Maybe a shell) and striking a pose. There is a black background and the octopus is a beautiful red and orange.A tiny juvenile East Pacific Red Octopus (Octopus rubescens) sitting on a piece of wood sticking out of the sandy sea floor. There is green plant matter at the bottom of the wood. The octopus is less that 2 cm long. Its arms are below it, go out and then curl. The octopus has its papillae raised, giving it a bumpy texture. Its mantle goes to a rounded tip, and the mantle is resting behind its head on its arms. The octopus has a line shaped pup that it is tilted slightly down, giving it a determined appearance. The octopus is a beautiful ruby red, with some beigish red areas on top.Three East Pacific Red Octopus paralarva (Octopus rubescens) piled up in the corner of a clear container. They are translucent with orange chromatophores on their mantle and arms and you can see organs inside the mantle. There is a ruler in the container and you can see the octopus are about 8 millimetres in length, although two are on a diagonal and so only appear to be 5 to 6 millimetres in lengthA East Pacific Red Octopus (Octopus rubescens) sitting in a shallow plastic container that is held by a person. It looks like it was just collected while tide pooling. The octopus is sort of sitting up, so it has its head and half of its mantle out of the water, with its arms mostly in the water. It has two rows of suckers. The octopus is dark red, with some orange at the ends and undersides of its arms. The parts out of the water look shiny. The background is out of focus, but you can see water, rocks and pink/purple sea plants.
@cephalopodsdaily.bsky.socialOct 1, 2026, 9:07 PM

The glass octopus (Vitreledonella richardi) has a body that is almost completely transparent. They live water column instead of on the sea floor, so this helps them avoid being seen by predators.

The only parts of its body that are opaque are its eyes, digestive tract and chromatophores

#OCTOtober

A glass octopus (Vitreledonella richardi) floating in the ocean. It is letting its mantle flop down, with its arms going up and then flopping down. Its skin is transparent, with a blue tinge. Visible in its mantle is its orange tube shaped digestive tract. Its eyes are also not transparent.A glass octopus (Vitreledonella richardi) floating in the ocean. It's skin is transparent, with a light blue tinge. Visible in its mantle is its orange tube shaped digestive tract. Its eyes and optical cord are also not transparent and are orange. Between its arms is clear webbing, sprinkled with gold coloured chromatophores.A glass octopus (Vitreledonella richardi) floating in the ocean. It's skin is transparent, with a blue tinge. Visible in its mantle is its orange tube shaped digestive tract. Its eyes and optical cord are also not transparent and are orange. Between its arms is clear webbing, sprinkled with gold coloured chromatophores.A glass octopus (Vitreledonella richardi) floating in the ocean. It's skin is transparent, with a like blue tinge. Visible in its mantle is its orange tube shaped digestive tract. Its eyes and optical cord are also not transparent and are orange. Between its arms is clear webbing, sprinkled with gold coloured chromatophores.