Two individuals of Thecacera sesama sp. nov. feeding on a bryozoan. Credit: Ho-Yeung Chan et al., 2026. A tiny new species of sea slug, smaller than a grain of rice, has been discovered off the coast of Keelung in northern Taiwan. The translucent marine creature, covered in distinctive black and yellow markings, has officially been named Thecacera sesama by researchers from National Taiwan Ocean University, the National Museum of Natural Science, and National Taipei University of Education. The