Thousands of meters below the surface, where darkness, cold, and colossal pressure prevail, life nonetheless thrives. In 2019, a scientific expedition revealed the existence of beings as fragile as they are unexpected: three newly identified species of snailfishes, whose features astonish researchers to this day. Their discovery serves as a reminder of how the oceans, despite decades of exploration, remain a largely uncharted territory.
An Unlikely Encounter in the Abyss
During a dive conducted with the submersible Alvin, a team of researchers captured footage of a strange creature: a pink, bumpy mass with oversized eyes and an unusually high number of pectoral fins. When brought to the surface for study, the animal proved to be a new species of snailfish. Named Careproctus colliculi, or beaded snailfish, it was quickly joined by two previously unknown “cousins”: a dark snailfish, Careproctus yanceyi, and a smooth snailfish from the genus Paraliparis.
These three specimens were observed in the Pacific Ocean, at the Station M research site, an area nonetheless one of the best documented in the deep sea. The fact that two of these newly described species were collected during the same dive highlights how enigmatic deep-sea biodiversity remains, even in places that have been studied for decades.
Creatures Adapted to an Extreme World
Snailfishes belong to the Liparidae family, a group comprising more than 400 known species. Their hallmark is their occupation of a wide range of habitats: some live in simple tidal pools, others colonize the deepest realms of the ocean. Despite this diversity, they share a recognizable silhouette, with a large head and a gelatinous body.
The beaded snailfish is fascinating for its 22 rays of the pectoral fins, clearly visible in the footage captured by the Monterey Bay Aquarium Research Institute (MBARI) robots. These rays do not serve only for locomotion: they also enable the animal to perceive its surroundings. Many fishes can “taste” through these structures, and the newly described species seem to use their fins as true sensory organs. In a world where sunlight never reaches, this capability is a vital asset.
Color: A Trivial Detail in the Darkness
Among the three described species, the color differences are striking: pink for the beaded snailfish, black for the other two. Yet, thousands of meters below, these chromatic variations lose all biological significance. As marine biologist Mackenzie Gerringer, who led the study, explains, these fishes likely interact through other signals, such as water vibrations or dissolved chemical cues. Occasional flashes of bioluminescence do occur in these depths, but their exact role in how these animals perceive their environment remains to be determined.
This unexpected diversity illustrates a rule of the abyss: what seems insignificant to our eyes can prove essential for survival in a world radically different from our own.
A Living Laboratory to Understand Resilience
Studying these species also means understanding how life adapts to extreme conditions. In the abyss, temperatures are frigid, pressure runs hundreds of times higher than at the surface, and food is scarce. Yet snailfishes flourish. Their gelatinous bodies, distinctive metabolism, and sensory capabilities enable them to transform this hostile environment into a natural habitat.
For Mackenzie Gerringer, a biology professor at SUNY Geneseo, these discoveries are not merely scientific advances. They represent a source of awe and a call to protect deep-sea ecosystems. The oceans cover more than 70% of our planet, and the abyssal zone constitutes the largest habitat. Yet it remains largely unexplored and vulnerable to human threats, notably deep-sea mining.
The Abyss, a Fragile Heritage to Preserve
The study, published in the journal Ichthyology & Herpetology, reminds us that there remains much to learn about the seafloor. Discovering three new species in such a well-studied zone shows that we have explored only a tiny fraction of this world. To scientists, these snailfishes are both subjects of study and symbols: a testament to the resilience of life and a reminder of the necessity to understand better before exploiting.
The abysses are not merely a frightening or inhospitable backdrop. They are the home to organisms that challenge our knowledge and push the boundaries of biology. Each discovery, like that of these snailfishes, brings us a little closer to a fundamental truth: our planet still harbors countless mysteries, and it is our collective responsibility to safeguard them.
