All articles tagged with #cephalopods
Two new studies suggest that octopus intelligence stems from unique evolutionary changes in genome structure and protein synthesis. Researchers found that a massive reshuffling of DNA in the common ancestor of coleoid cephalopods created new regulatory connections, while a specific ribosomal RNA mutation in shallow-water octopuses improved protein accuracy, potentially supporting their complex nervous systems.
New research suggests squid populations have expanded over the last century due to warmer seas and changes in predator abundance, but the rise isn’t a straightforward replacement for depleted fish stocks. Modeling shows predator loss boosts squid, yet warmer temperatures can reduce their biomass, and the rapid squid life cycle helps them exploit disturbed ecosystems. Overall, the mechanisms are still unclear and the findings come from a bioRxiv preprint, not yet peer-reviewed.
Fifteen years ago, a Japanese research team photographed about 100 neon flying squid leaping from the Pacific and gliding in near-formation for roughly 30 meters, likely using their hyponomes to propel themselves. The neon flying squid (Ommastrephes bartramii) are social cephalopods that rise near the surface to feed, and while the exact purpose of the group gliding remains unclear, predator evasion is a leading hypothesis.
A team analyzing 79 cephalopod species finds bigger brains are more tied to ecological complexity—habitat type, depth, and foraging rewards—than to social interactions, supporting a new asocial path to brain evolution and challenging the traditional social brain hypothesis.
New research argues big brains aren’t solely a product of social living. An analysis of 79 cephalopod species shows habitat and ecological complexity better predict brain size than sociality, with bottom-dwelling, shallow-water species having larger brains even when solitary. The findings support the cultural brain hypothesis, which posits brains evolve to store and process information learned either socially or asocially, implying multiple evolutionary routes to intelligence beyond social structures. While correlation cannot prove causation, the study suggests ecology as a primary driver of cephalopod brain size and invites reevaluation of brain-evolution theories.
Scientists found giant octopuses up to 19 meters long were the true apex predators of the Late Cretaceous seas, with fossil jaws of Nanaimoteuthis jeletzkyi and Nanaimoteuthis haggarti showing wear that signals powerful carnivory and rivaled mosasaurs in size; the findings, published in Science, place these intelligent cephalopods among the top hunters of the dinosaur era.
Using synchrotron imaging, researchers reclassified Pohlsepia mazonensis as a nautiloid relative Paleocadmus pohli, overturning the fossil's status as the oldest octopus and pushing crown octopus divergence to the Jurassic, while highlighting the oldest nautiloid soft-tissue preservation in the Mazon Creek deposits.
An editorial argues that cephalopods (octopuses, cuttlefish, and squid) deserve stronger welfare protections in research due to their sentience and complex brains; despite decades of safeguards for vertebrates and EU rules extending protections to cephalopods, analgesics for these animals are scarce, hindering humane care. The piece calls for global adoption of higher welfare standards, continued development of pain-relief options, and consideration of a UN convention on animal health and protection to ensure ethical, high-quality science.
Fossilized beaks from two giant Cretaceous octopuses suggest they grew up to 62 feet long and hunted in oceans about 100 million years ago, potentially rivalling apex predators like mosasaurs and plesiosaurs. Jaws show wear indicating they could dismantle hard-shelled prey, and signs of lateralized behavior imply brainier hunting patterns similar to modern octopuses, marking them as prehistoric top predators, though size estimates carry uncertainties.
Using high‑resolution tomography and AI on Cretaceous rocks from Japan and Vancouver Island, researchers reconstruct Nanaimoteuthis haggarti as a colossal 60‑foot octopus that ground shells and bones with a massive beak, likely making it an apex predator in its ecosystem and possibly among the oldest finned octopuses; the study also suggests brain lateralization, though that claim will need more evidence.
Whole-genome analysis places the divergence of squid and cuttlefish about 100 million years ago in the Mid‑Cretaceous. After a long period of little change, the End‑Cretaceous asteroid crisis drove these soft-bodied cephalopods into deep-water refuges, followed by rapid diversification as reefs rebuilt in shallower waters, with shell loss or reduction helping many lineages cope with ocean acidification and expanding the modern Decapodiform diversity.
New analysis of 15 fossil jaws from Japan and Vancouver Island, plus 12 more from Japan using digital fossil mining, estimates Late Cretaceous octopuses ranged 23–62 ft and were likely apex predators, with wear on their beaks indicating they crushed hard prey—making them among the largest invertebrates and possibly rivals to marine reptiles and sharks.
A 300-million-year-old fossil long considered the world’s oldest octopus (Pohlsepia mazonensis) has been reclassified as a nautiloid (Paleocadmus pohli) after synchrotron imaging revealed internal features incompatible with octopuses, overturning about 150 million years of cephalopod timing and reshaping our understanding of when octopuses first appeared.
New synchrotron imaging of the 300-million-year-old fossil Pohlsepia mazonensis shows it is a nautiloid relative, not an octopus. The fossil reveals a nautilus-like radula with 11 tooth-like elements per row and other features, leading researchers to reclassify the find and push octopus origins into the Mesozoic era (late Jurassic at latest). Published in Proceedings of the Royal Society B, the study also provides the oldest soft-tissue evidence of a nautiloid, reshaping our understanding of cephalopod evolution.
Scientists have bioengineered bacteria to produce large quantities of the rare pigment xanthommatin, which is responsible for the camouflage abilities of octopuses and squids, using a novel growth-coupled biosynthesis method that significantly increases yield and could advance both biological understanding and industrial applications.