World’s biggest sea snail: The Australian trumpet is nearly the size of a human leg and hunts hidden prey
Times of India
by TOI LIFESTYLE DESKFebruary 20, 2026
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The Australian trumpet sea snail, Syrinx aruanus, is the largest living gastropod, with shells reaching nearly 91 centimeters in length—about the size of a human leg. Known for its striking appearance, this species has long intrigued collectors and researchers alike. However, until recently, much about its biology and feeding habits remained poorly understood. A study conducted on a small population near Western Australia's Burrup Peninsula aimed to uncover more about this enigmatic creature.
Researchers observed the Australian trumpet in shallow intertidal flats, focusing on its feeding behavior. Using a specialized proboscis, it actively hunts large marine worms hidden in sediment. The snail’s radula and extensible proboscis are uniquely adapted for this predatory lifestyle, allowing it to reach deep into worm tubes buried below the surface. Fieldwork and laboratory analysis confirmed that the snail’s diet primarily consists of soft-bodied polychaete worms from families like Acoetidae and Terebellidae.
What sets the Australian trumpet apart is its focus on soft-bodied prey rather than the hard-shelled molluscs or echinoderms consumed by many other large marine snails. This specialized feeding strategy aligns with patterns seen in its Turbinellidae family, suggesting a consistent evolutionary approach to predation among related species. The heavy shell of Syrinx aruanus serves as structural support for muscle attachment during feeding rather than functioning as a hunting tool.
The findings are significant for conservation efforts. Despite its size and iconic status, the Australian trumpet’s populations have declined in accessible areas due to shell collecting. Improved understanding of its diet and habitat preferences can inform strategies to protect this unique species and ensure its survival in the wild. For such a large and striking creature, unlocking these secrets offers valuable insights into marine
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Originally published on Times of India on 2/20/2026