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Cephalopods have large, well-developed brains, [8] [9] [10] and their brain-to-body mass ratio is the largest among the invertebrates, falling between that of endothermic and ectothermic vertebrates. [11] The nervous system of cephalopods is the most complex of all invertebrates.
The California two-spot octopus has had its genome sequenced, allowing exploration of its molecular adaptations. [48] Having independently evolved mammal-like intelligence, octopuses have been compared by the philosopher Peter Godfrey-Smith, who has studied the nature of intelligence, [173] to hypothetical intelligent extraterrestrials. [174]
All living cephalopods have a two-part beak; [12]: 7 most have a radula, although it is reduced in most octopus and absent altogether in Spirula. [ 12 ] : 7 [ 98 ] : 110 They feed by capturing prey with their tentacles, drawing it into their mouth and taking bites from it. [ 25 ]
[3] Since most of the animals' neurons are in their partly-autonomous arms, "'for an octopus, its arms are partly self – they can be directed and used to manipulate things. But from the central brain's perspective they are partly non-self too, partly agents of their own.' This is as alien a mind as we could hope to encounter."
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In the video above, the scientist explains that this particular species of octopus has "beaks for mouths and their brains are donut-shaped and surround their esophagus.
These selective pressures may explain why the octopus’ brain is the largest of any invertebrate and vastly larger and more sophisticated than the clams. There’s another concept that comes into ...
Arms and buccal mass of the squid Taningia danae.As in other Octopoteuthidae, the tentacles are absent in adults. Oral view of the bobtail squid Semirossia tenera Head and limbs of the bobtail squid Rossia glaucopis Oral view of male Bathypolypus arcticus with hectocotylus on arm III (left) Cephalopod suckers and configuration of suckers on tentacular club Serrated suckers of a giant squid ...