Sialis lutaria refers to a species of aquatic insect commonly known as the alderfly or the dobsonfly. This insect can be found in freshwater habitats across Europe, Asia, and North America. Although it may not be a well-known insect, it is an essential part of the aquatic ecosystem as it plays an important role in the food chain. The alderfly is also referred to by other common names such as the hellgrammite, the toe biter, and the fishfly, which are all synonyms for this remarkable insect. Regardless of the name, this insect deserves our admiration for its unique physical characteristics and ecological contributions.