Family Mysidae is a group of small, shrimp-like crustaceans found in both freshwater and saltwater habitats. They are also commonly known as opossum shrimps due to their habit of carrying their clutch of eggs in a brood pouch on the underside of their abdomen, similar to a marsupial. Other synonyms for Family Mysidae include mysids, seed shrimps, and brine shrimp. Mysids are an important part of the food web for many aquatic animals and are also used in scientific research as bioindicators of water quality. Overall, the Family Mysidae is a diverse and intriguing group of crustaceans that play an important role in aquatic ecosystems.