We introduce the unique burrow systems of Laomedia sp. nov., which were previously unreported, and compare burrows between the Saemangeum and Gomso tidal flats, which have differing environmental characteristics. The burrows of Laomedia sp. nov. are constructed and maintained by a pair of male and female shrimp. The upper part of the burrow consists of a horizontal gallery and a vertical shaft connected to the surface. Several horizontal galleries merge into two branched galleries, which then merge into the main gallery, comprising the middle part of the burrow. The main gallery is skewed obliquely, spiraling with regular directional changes and extending downward, maintaining a consistent twist direction. Bulging chambers (maximum volume, 590 cm3) are located where the main gallery twists into a spiral. The distinctive structures of Laomedia sp. nov. burrows are characterized by (1) the merging of two branched galleries into a main gallery, (2) the spiral structures, and (3) large-volume chambers. These unique structures, which are not found in other thalassinideans, could be mostly attributed to the ecological characteristics of this species, in which a pair of male and female shrimp cohabit within a single burrow. The maximum depth, surface area, and volume of burrows differed between tidal flats, at 145 cm, 16,180 cm², and 18,163 cm³ at the Saemangeum flats and 198 cm, 12,267 cm², and 10,325 cm³ at the Gomso flats, respectively. This dimensional variation between the two tidal flats is caused by differential tidal conditions and sediment characteristics. Laomedia sp. nov. burrows increase the sediment–water interface area by up to 1,511%, which is the highest value observed among marine invertebrate burrows. This study is the first report to identify the unique burrow systems of Laomedia sp. nov.