Have you ever wondered if there are creatures capable of becoming practically invisible underwater? Well, it turns out there are, and it's not science fiction. Recently, the team at the Schmidt Ocean Institute astonished everyone by filming the glass octopus , a fascinating creature that inhabits the most remote areas of the Pacific Ocean.
This animal is a true gem of nature, with a gelatinous body that is almost transparent, allowing only its eyes and optic nerve to be seen. It's a superb survival strategy for someone who lives in absolute darkness, specifically between 200 and 1.000 meters deep, where camouflage is the difference between eating and being eaten.
The enigma of Microeledone galapagensis
But that's not all, because science has made another amazing discovery some 1.773 meters below Darwin Island in the Galápagos. A group of experts led by Janet R. Voight of the Field Museum in Chicago, along with the University of Bonn and the Charles Darwin Foundation, described a species that wasn't in any book: Microeledone galapagensis.
This octopus is tiny and has a somewhat squat appearance, with short arms and very few suckers. What's truly striking is its dorsal skin, which is practically devoid of pigment . While most deep-sea cephalopods use dense chromatophores to regulate their appearance, this specimen is almost translucent on the outside, giving it a ghostly look, almost as if it were a larva rather than an adult.
An anatomy that breaks the rules
This is where the story gets interesting. Thanks to microCT technology, which is essentially computed tomography at the micrometer scale, scientists discovered that the animal has inverted countershading . This means that, although it appears glassy on the outside, its internal dorsal musculature has very dense pigmentation. In other words, what should be on the outside is hidden inside the muscle.
This pattern is very unusual, as animals typically have dark backs to blend in with the background and light bellies to camouflage themselves with surface light. Microeledone galapagensis does the exact opposite, and while marine biology hasn't yet provided a definitive answer, it's believed to be due to heterochrony , which is essentially a change in the rate of embryonic development.
The science of never finishing growing up
Heterochrony is a key concept here, as it produces adults that retain typical juvenile traits, a phenomenon also known as neoteny. That's why this octopus, although functional and adult, maintains short arms and colorless skin , as if its growth clock had stopped prematurely.
Furthermore, this discovery has caused a taxonomic earthquake. Upon closer analysis, they realized that the animal lacks an ink sac and a crop diverticulum. This is crucial because both structures were considered essential for defining the Megaleledonidae family, so now they have had to rewrite the rules for an entire family of cephalopods.
What remains to be discovered
Despite the exciting discovery, many questions remain. Since the specimens were collected only from a specific area of ​​the Galápagos Islands, we don't know if the octopus lives throughout the eastern Pacific or if it is exclusive to that region . The next step will be to conduct molecular analyses to accurately place it within the cephalopod family tree.
We also know nothing about what it eats, how it behaves, or how it reproduces. But that's how deep-sea taxonomy works: describing a species is just the beginning of a journey that can last decades. The fact that a place as thoroughly studied as the Galápagos Islands holds these secrets proves that the ocean floor remains the most mysterious place on our planet.
The discovery of these creatures, from the glass octopus to the Microeledone galapagensis, reveals the amazing adaptability of life in the abyss, where transparency, pigment inversion, and the retention of juvenile traits allow survival in the absolute darkness of the Pacific.