Common Aquatic Invertebrates in the Spring Creek Watershed
A female Callibaetis mayfly from Millbrook Marsh. Aquatic invertebrates are animals without backbones that live in water. Invertebrates that are too small to be seen with the naked eye are “microinvertebrates,” while those that can be seen without the help of a microscope are “macroinvertebrates.” Most macroinvertebrates are larger than 1 mm in size, and freshwater macroinvertebrates include thousands of species of insects, crustaceans, mites, molluscs (clams, mussels and sn