Researchers Identify New Deep-Sea Marine Worm Genus

A study details seven new species of marine worms discovered at depths exceeding 670 metres near Australian territories.

Updated on Oct. 27, 2026 in Life Sciences

A bioluminescent marine worm clings to a dark, rocky ocean floor in the deep sea. — Researchers have identified a new genus of deep-sea marine worms, Terebellosuctoria, discovered during deep-sea expeditions near Australia's Cocos and Christmas Islands. AI Illustration. Upload story photo >

Scientists have identified a new genus of deep-sea marine worms named Terebellosuctoria, part of a broader discovery of seven new species. The findings, published in the Records of the Australian Museum in July 2026, follow extensive deep-sea exploration.

Why it matters

This discovery sheds light on the biodiversity of deep-sea environments and how organisms adapt to extreme habitats. The worms possess unique suction-cup structures that likely allow them to anchor to seamount slopes where sediment is scarce.

Researchers utilised morphological analysis, DNA sequencing, and scanning electron microscopy to classify the worms, which measure up to 75 millimetres in length. Specimens were retrieved from depths greater than 670 metres.

The players

CSIRO

The Commonwealth Scientific and Industrial Research Organisation is the Australian federal government agency responsible for scientific research.

Australian Museum

Located in Sydney, this is the oldest museum in Australia and a hub for scientific research and collections.

The details

The research team collected over 850 specimens during expeditions in 2021 and 2022 using the CSIRO research vessel Investigator near the Cocos (Keeling) Islands and Christmas Island. Two of the seven new species identified, including Terebellosuctoria jimii, belong to the newly established genus Terebellosuctoria within the polychaetes class.

Expeditions were conducted throughout 2021 and 2022.
The study was published in July 2026.

The Big Picture

This discovery aligns with the ongoing objectives of the CSIRO research vessel Investigator's biodiversity survey programme. It provides critical data that fills gaps in our understanding of deep-sea polychaetes, challenging previous assumptions about how these organisms survive in sediment-poor zones.

While this discovery does not change daily life, it advances the technological development of deep-sea sampling tools and marine biology research methods. These innovations in observation and data collection often lead to broader insights regarding ocean health and climate resilience.

The takeaway

Understanding the adaptations of deep-sea life highlights the complexity of ecosystems found on remote seamounts. These findings demonstrate the vast amount of biological diversity that remains to be discovered in the deep oceans surrounding Australia.