May 7th marks Deep Day, a global day of awareness and action dedicated to the deep sea. Founded by the Deep Sea Conservation Coalition, it aims to raise awareness of the deep sea’s immense ecological importance and call for its protection against threats like deep-sea mining and destructive fishing.
To celebrate the wonders of our oceans and raise awareness of the incredible biodiversity of the deep sea, we at Pensoft Publishers would like to highlight some of the remarkable marine studies that have recently been published in our scientific journals.
A Global Collaboration to Uncover Deep-Sea Amphipods
Demonstrating the power of global teamwork, an international group of experts recently discovered 24 new deep-sea amphipod species in the central Pacific Ocean’s Clarion-Clipperton Zone (CCZ). Researchers from institutions worldwide, including the University of Lodz and the National Oceanography Centre, came together for a coordinated taxonomy workshop to achieve this. Their work revealed a completely new evolutionary branch with the discovery of a new superfamily, Mirabestioidea.
Crucially, their findings form part of the International Seabed Authority’s Sustainable Seabed Knowledge Initiative (SSKI) and its ‘One Thousand Reasons’ project, which aims to formally describe 1,000 new species by the end of the decade.
Highlighting the importance of this joint effort, Dr. Anna Jażdżewska from the University of Lodz shared:
This was a truly collaborative process that allowed us to achieve the ambitious goal of describing more than 20 species new to science within a year – something that would not have been possible if each of us worked independently. The team’s findings provide information that is crucial for future conservation and policy decisions.
Learn more in the Special Issue: New deep-sea Amphipoda from Clarion-Clipperton Zone
What lives 10 km below the surface?
Another recent expedition provided a profound look at life up to nearly 10 kilometers below the surface in the Japan, Ryukyu, and Izu-Ogasawara trenches, cataloging at least 108 distinct organism groups. The research captured rare footage of species interactions at extreme depths – and one baffling, unidentified animal that has left taxonomists worldwide perplexed.
Rather than using traditional trawls that can damage fragile organisms, the team utilized crewed submersibles and free-fall baited landers. Explaining the value of this non-destructive method, the research team noted:
This combination enabled us to build the most comprehensive visual baseline yet for abyssal and hadal megafauna in the Northwest Pacific to date.
They added that the study aims to establish a foundation for the future, emphasizing that:
More than anything, the hadal zone remains one of Earth’s least-explored and most intriguing frontiers.
Learn more: Jamieson AJ, Swanborn DJB, Bond T, Cundy MC, Fujiwara Y, Lindsay D, Stott MS, Kitazato H (2026) Faunal biodiversity of the lower abyssal and hadal zones of the Japan, Ryukyu and Izu-Ogasawara trenches (NW Pacific Ocean; 4534-9775 m). Biodiversity Data Journal 14: e182172. https://doi.org/10.3897/BDJ.14.e182172
The Internet Names a New Deep-Sea Chiton
Finally, highlighting a unique way the public can engage with science and taxonomy, a recently found deep-sea chiton was named by the internet after science YouTuber Ze Frank featured it in an episode of his “True Facts” series. Originally discovered in 2024 within the Izu-Ogasawara Trench at a depth of 5,500 meters, this new species belongs to the genus Ferreiraella, a rare and specialized group of mollusks that live exclusively on sunken wood in the deep sea.
From over 8,000 suggestions submitted across social media, the research team selected the name Ferreiraella populi. The epithet populi is a Latin singular noun in the genitive case meaning “of the people”.
Prof. Dr. Julia Sigwart, co-chair of the Senckenberg Ocean Species Alliance (SOSA), emphasized the broader significance of this public discovery:
Ferreiraella populi exemplifies the overwhelming biodiversity of the oceans, the vast majority of which remains unexplored. Many species go extinct before we even know they exist – this is especially true for marine invertebrates.
Learn more: (SOSA) SOSA, Chen C, Frank H, Kraniotis L, Nakadera Y, Schwabe E, Sigwart JD, Trautwein B, Vončina K (2026) Ocean Species Discoveries 28–30 — new species of chitons (Mollusca, Polyplacophora) and a public naming competition. Biodiversity Data Journal 14: e180491. https://doi.org/10.3897/BDJ.14.e180491
These studies highlight the vastness of the unexplored frontier that our deep seas and oceans offer. Revealing this hidden life – from entirely new evolutionary branches of amphipods to records of unknown organisms – requires global collaboration, cutting-edge exploration technologies, and the involvement of the general public.
Ultimately, this shared pursuit of discovery provides the fundamental knowledge crucial for conservation and policy decisions. As Deep Day reminds us of the encroaching threats from deep-sea mining, human-derived debris, and destructive fishing, we must work together to understand these fragile habitats so that we can effectively protect them and #DefendtheDeep.
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