Sea Slug Smaller Than a Sesame Seed Found in Taiwan
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📰 The quick summary: Scientists in Taiwan have identified a new sea slug species smaller than a sesame seed, offering a glimpse into the many undiscovered marine creatures hiding in coastal waters.
📈 One key stat: Measuring less than three millimeters long, this tiny nudibranch highlights just how many minuscule ocean species likely remain undocumented by science.
💬 One key quote: “Nudibranchs are one of the key players in the marine food web,” the researchers noted, adding that many are so small they are extremely difficult to spot underwater with the naked eye.
1️⃣ The big picture: A new species of sea slug, named Thecacera sesama, has been discovered in the coastal waters of Keelung, Taiwan, and it is barely larger than a sesame seed. Researchers from three Taiwanese institutions described the nudibranch, which features a translucent body with black and yellow markings and measures less than three millimeters in length. The discovery traces back to 2019, when lead author Ho-Yeung Chan came across the creature during a recreational dive as an undergraduate student. He only realized it was an unknown species after consulting a sea slug expert on Facebook. The findings were published in the open access journal ZooKeys on May 11, 2026.
2️⃣ Why is this good news: Finding a species this small opens the door to a broader understanding of marine biodiversity, especially in waters that remain understudied. Nudibranchs play a key role in marine food webs, so documenting new species helps scientists build a more complete picture of how ocean ecosystems function. The research team believes Thecacera sesama may be just one of many undiscovered species living in Taiwan's coastal waters, suggesting that continued exploration could reveal a rich and largely hidden world of marine life. Citizen science also played a meaningful role here, since an undergraduate diver and a social media consultation helped spark a formal scientific discovery, showing that you do not need to be a senior researcher to contribute to expanding our knowledge of life on Earth.
3️⃣ What’s next: Researchers plan to continue diving in Taiwan's waters during the limited four-month window each year when conditions allow for nudibranch studies. Scientists also noted that the bryozoan species on which Thecacera sesama feeds may itself be undescribed, pointing to yet another potential discovery. Broader surveys of Taiwan's coastal waters could uncover additional species and deepen our understanding of small marine organisms.
Read the full story here: SciTechDaily – Scientists Discover a Sea Slug Smaller Than a Sesame Seed in Taiwan
