1. Genus: Gramineae belong to the phylum Arthropoda, class Insecta, and sandworms belong to the phylum Annelida, class Polychaeta.
2. Morphology: Harvestmen have obvious segmentation of the body, and the two sides of the body segments are protruding into warty feet with bristles, which usually grow in the paddy fields. Sandworms, also called sea intestines, are similar in shape to an intestine, and their morphology is long and cylindrical.
3. Distribution: Harvest bugs are mainly distributed in the Pearl River Delta region of Guangzhou. Sandworms are mainly distributed in Yantai, Pingtan, Xiamen, Xiaodeng Island, Zhanjiang, Haikou, Taiwan and other regions.
4. Food: The grasshopper feeds on rice roots. Sandworms are seafood products, feeding on fish, shrimp and plankton.