Shrimp belongs to crustaceans. There are many pigment cells in the dermis under crustaceans, which are usually dark green or cyan. When heated, many pigment cells are destroyed and decomposed, leaving only red pigment.

Longarm shrimp

Macrobrachium macrobrachium belongs to Decapoda, Amphibidae and Macrobrachium in taxonomy. The famous Macrobrachium rosenbergii is the largest freshwater shrimp. Taihu white shrimp is a famous long-legged shrimp, commonly known as "crystal shrimp", which grows in the open waters of Taihu Lake.

Macrobrachium macrobrachium belongs to Decapoda, Amphibidae and Macrobrachium in taxonomy. The famous Macrobrachium rosenbergii is the largest freshwater shrimp. Arthropods, crustaceans.

Palaemontidae is the most diverse and widely distributed family in Palaemonoidea, including 2 subfamilies, 102 genus, which are distributed all over the world, mainly in shallow water and coastal areas, up to 1820 m deep sea, and widely distributed in China. Palaemoninae is generally large in size, mainly distributed in shallow water-fresh water, with free life and thin body.

Aphidinae mainly lives in the ocean and mostly lives with other marine life, so it is smaller and fatter. According to their living environment, most genera in the undergraduate course can be easily classified as short-billed suborder or cryptobilled suborder, and these genera can be identified by their contours. Anatomy and comparison of mouthparts can accurately identify many genera.