Alderflies comprise the most speciose genus (Sialis ca. 60 species) of Megaloptera. They occur in many different waterbody types including small streams, rivers, and lakes. Larvae are found commonly in Florida waters, typically living in depositional areas that contain plant debris. Only 4 species are known in Florida, but additional species are likely to be present. Larval identification to species is problematic. The species known from Florida are all widespread across much of eastern North America.
Species:
Sialis sp., larva [from Ross (1937)]
Sialis americana (Rambur) is the most widespread Sialis species in Florida. It has been collected from lakes and streams of the eastern panhandle and across much of the peninsula. Adults are present in May and September.
Sialis joppa Ross is known from only Torreya State Park within the panhandle's Apalachicola Bluffs and Ravines Region. Adults were captured in May.
Sialis itasca Ross is known from a single locality. Adults were collected in April at a reservoir located near Tallahassee.
Sialis vagans Ross is known from a few streams in the western panhandle. Adults are present in March.
Sialis sp., adult [from Ross (1937)]
page content updated 24 October 2003