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Portunustrituberculatus, commonly known as the pike crab, flying crab. The term "flying crab" is synonymous with the term "portunus trituberculatus".

The body color of the pike crab varies with the surrounding environment. Individuals living in the sandy bottom, the cephalothorax is light gray-green, the gill area with a round white spot, chelicerae large part of the three warty pike crab is purplish-red with white spots, a part of or the entire ventral surface is white, the first three pairs of step foot long joints and carpal joints are white, the palm of the bluish-white, the soft hairs of the brown.

The knuckles are purplish-blue or purplish-red, the fourth pair of pedipalps are green with white spots, and the tips of the fingers are purplish-blue. Individuals living among seagrasses are darker in color. It is omnivorous and eats fish, shrimp, shellfish and algae, and even eats its own kind, preferring dead animals.　

The cephalothoracic armor is pike-shaped and slightly elevated. There are three prominent warty elevations on the surface, one in the stomach area and two in the heart area. Its body shape resembles an ellipse, and the two ends are pointed like a weaving shuttle, so it has the name of three warty shuttle crab. Each of the two anterior lateral margins has 9 serrations, the 9th serration is particularly large, extending to the left and right. The frontal margin has 4 small teeth. There is 1 pair of rotating compound eyes with stalks on both sides of the forehead.

There are 5 pairs of thoracic legs. The stinging foot is well developed, with a long segment that is prismatic, and the inner margin is bluntly toothed. The fourth pair of steppers have flattened, broad and thin knuckles like paddles, suitable for swimming. Abdomen flat (commonly known as the crab navel), male crab abdomen is triangular, female crab is rounded. The male crab back tea green, female crabs purple, the ventral surface are gray-white.