The pretty far reaching study we blogged last week, about Octopi coming from outer space, is really most likely, probably, near certainly not true.

Via Space.com

For evidence of the panspermia hypothesis, the authors wrote in their new paper, skeptics need only look to the octopus.

Octopuses have complex nervous systems, camera-like eyes and a capacity for camouflage that evolved suddenly and without precedent in their family tree, according to the study authors. The genes for these adaptations, the authors wrote, do not seem to have come from octopus ancestors, but "it is plausible then to suggest [these traits] seem to be borrowed from a far distant 'future' in terms of terrestrial evolution, or more realistically from the cosmos at large."

In one theory laid out in the paper, the authors posit that fertilized octopus eggs crashed into the sea aboard an icy comet at the onset of the Cambrian explosion. Another explanation, they propose, could be that an extraterrestrial virus infected a population of early squid, causing them to evolve rapidly into octopuses as we know them today.

Other researchers were not quick to embrace this theory. "There's no question, early biology is fascinating — but I think this, if anything, is counterproductive," Ken Stedman, a virologist and professor of biology at Portland State University, told Live Science. "Many of the claims in this paper are beyond speculative, and not even really looking at the literature."

For example, Stedman said, the octopus genome was mapped in 2015. While it indeed contained many surprises, one relevant finding was that octopus nervous system genes split from the squid's only around 135 million years ago — long after the Cambrian explosion.

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In the video above, The National Geographic explains chromatophors, the pigment-changing cells in certain species of octopus.

The blue-ringed octopus is venomous and entirely willing to let you know before you get too close. Karel Mestdagh shot this video on a Samsung Galaxy S4 in a waterproof case:

Octopuses' camouflage is a behavioral as well as colorful performance, mimicking other sea creatures from lionfish to cuttles:

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The jewelry looks just as good as these pieces but their production doesn't harm any octopuses; they're made from high-quality Sterling and the rings come with three different finishes. The earrings are $20 and are through-the-ear/wrap around; the $40 rings can be easily adjusted for different-sized fingers. Both get top marks from reviewers.

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What Latin species designation do you give an orange-pink octopus that resembles a Pac-Man ghost or Pearl from Finding Nemo? Why, adorabilis of course! Read the rest

Too bad it wasn't carrying a clarinet so I could make a Squidward joke.

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In a piece on octopus farming, Katherine Harmon mentions a fascinating fact — octopuses don't have an adaptive immune system, the handy-dandy network of different immune-response cells that allow us vertebrates to more easily fight off infections our bodies have encountered before.

That's a problem if you're trying to raise a bunch of invertebrates in close quarters (as per a farm) because you can't immunize them against pathogens that could easily spread from one octopus to another. As a random biological tidbit, though, it's just damned fascinating. Check out this doctoral thesis for more information on how the octopus immune system does work. You should also read this story that looks at the evolution of the adaptive immune system and asks a key question — does having immune "memory" really make us that much better off than the animals that don't have it?

Image: Octopus, a Creative Commons Attribution Share-Alike (2.0) image from alicecai's photostream

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An octopus' life is short — two years is a pretty common lifespan — and heavily focused on reproduction. They only get one shot at carrying on the genetic lineage and die soon after breeding. Babies are born not by the two, or tens, or even hundreds. Instead, tens of thousands of octopus siblings enter the world all at once — tiny, translucent hatchlings that ride the waves and try not to die more quickly than they already must.

This footage of an brood of giant Pacific octopuses hatching was filmed by divers in Puget Sound just a couple of weeks ago.

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Given that people are going around doing things like cutting off octopus limbs in order to understand their distributed neuron processing system, it's worth asking some questions about how octopuses perceive pain, as well. That's more complicated than you might think. As Katherine Harmon explains, it's likely that octopuses have some kind of awareness of when they're touching something unpleasant. But just how that works, and how similar it might be to the way we vertebrates understand "pain", is a big mystery. Read the rest

Boy octopus meets girl octopus, and then they fall into one another's (many) arms.