Thalassina anomala, known as the scorpion mud lobster, is a species of crustacean in the family Thalassinidae.

[3] It is the most common decapod crustacean in the Sundarbans in India and Bangladesh, though it is often overlooked in traditional sampling efforts.

[3] Excavated mud from their nighttime burrowing activities can form hills that reach heights of 3 metres (9.8 ft).

In the monsoon season, its muddy nest becomes saturated with water and submerges, and the lobster is exposed, allowing it to be easily caught.

[7] The mud mounds provide habitat for other animals including Odontomachus malignus (an ant), termites, Episesarma singaporense (tree-climbing crab), Wolffogebia phuketensis (mangrove mud shrimp), Acrochordus granulatus (file snake), and plants such as the tree Excoecaria agallochoa and ferns.