How many types of macroinvertebrates are their?

There are thousands of types of macroinvertebrates, which are often categorized into several major groups, including insects (like mayflies and dragonflies), crustaceans (such as crayfish and amphipods), mollusks (like snails and clams), and worms (such as tubificids). The exact number of species varies widely depending on the ecosystem and region, but estimates suggest there are over 100,000 described species globally. These organisms play crucial roles in aquatic ecosystems, serving as indicators of environmental health.