Thalassina anomala (scientific name: Thalassina anomala) is an animal belonging to the family Thalassidae in the order Decapoda of the phylum Arthropoda in the animal kingdom. The head and chest armor of the sea squirt shrimp genus is slightly flattened and swollen on the side, slightly elliptical in shape, calcified and thick, with two longitudinal sutures (sea squirt shrimp sutures), small frontal horns, and pointed spines. Abdominal degeneration, slender and flat, without obvious lateral armor. The first and second steps are characterized by sub chelation of the feet, with the first pair being thick and asymmetrical, with the knuckles greatly extending beyond the end of the immobile fingers.