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Leptocheirus plumulosus, also known as crustaceans, are a group of crustaceans related to organisms such as crabs, barnacles, stilts, and abundant shrimp. Amphipods play an important role in marine ecosystems, with approximately 10000 species worldwide, including approximately 950 species in Mexico.

Some species of arthropods, such as talitrids, are sometimes referred to as sand fleas, but they do not bite humans. Cyamididae, also known as whale louses, typically only parasitize specific species of whales. For example, C. catodontis is mainly found in male sperm whales, while N. physeteriss is mainly found in female sperm whales. These parasitic relationships are sometimes related to the gender of whales. Cyamididae organisms will consume algae and shed skin on whales, but will not cause significant damage to them.

Some species of arthropods have the characteristic of floating and undergo diurnal vertical migration (DVM), where they stay deep in the water during the day and float to the surface to forage at night. In addition, crustaceans are also known as "bees in the ocean" because they can help aquatic plants spread pollen. These organisms vary greatly in size, with the smallest being only 1 millimeter and the largest reaching up to 29 centimeters. Female amphipods have a small pouch in their abdomen specifically designed for hatching larvae, where they develop. The hatched larvae will be protected in the burrows dug by female amphipods.

The living environment of crustaceans is diverse, and they can live in sponges, corals, sea squirts, or pipes made of oil, sand, and soil. Some of them can adsorb on fish gills to obtain food, some feed on plankton in water through filtration, and some feed on corpses. Epipods play an important role in the food chain of mollusks, fish, and birds, serving as food sources for seahorses, fish, shrimp, and polychaetes.