Sialis
Sialis is a genus of aquatic insects in the order Megaloptera, commonly known as alderflies. It belongs to the family Sialidae and includes numerous species distributed across the temperate regions of the Northern Hemisphere. Adults are small to medium-sized, with soft bodies, two pairs of wings that are usually clear or lightly colored, and long antennae. They typically rest with their wings held roof-like over the abdomen.
Sialis species undergo complete metamorphosis. Eggs are laid on vegetation or debris above or near water. Larvae,
Species occur in Europe, Asia, and North America. Sialis lutaria, the common alderfly, is widespread in Europe
Sialis is the type genus of the family Sialidae, one of the two extant families in Megaloptera,