“They use their arms for ‘taste by touch’ contact-dependent aquatic exploration of crevices in the sea floor.”
have always been a thing of curiosity to researchers and non-researchers alike. Known to be one of the most intelligent invertebrates, these cephalopods, the group which includes octopuses, squids, and cuttlefish, have a donut-shaped brain and three hearts. And of course, eight tentacles, usually.
Octopuses have more neurons in their arms than in their central brain. They use these tentacles or limbs to not only feel their environment but also to hunt their prey.Now two separate studies reveal how these squishy and mysterious beings have adapted and evolved over time to sense their marine surroundings.reveals how octopus sensory receptors evolved from acetylcholine neurotransmitter receptors, the same receptors that even humans have at their neuromuscular junction.
“They use their arms for ‘taste by touch’ contact-dependent aquatic exploration of crevices in the sea floor,” senior investigator Nicholas Bellono, associate professor in the Department of Molecular and Cellular Biology at Harvard.takes a look at how these chemical receptors arose in cephalopods, such as squids. Using a combination of genetic profiling, physiology, and behavioral analyses, the team found that squid receptors have adapted over time to sense bitter molecules in their surroundings.
Bellono, who was a co-author in the second paper as well, explains, “In this case, there were fewer receptors than in the octopus, and they looked more like the neurotransmitter binding pocket in that it can bind more hydrophilic molecules.
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