Chilostigma itascae, also known as the headwaters chilostigman or Headwaters Chilostigman Caddisfly, is a species of caddisfly in the family Limnephilidae

Limnephilidae

Limnephilidae is a family of caddisflies with about 100 genera. They belong to the main lineage of case-constructing caddisflies, the Integripalpia or tube-case caddisflies. The Limnephilidae is one of the most species-rich Trichoptera families of northern temperate regions, but only a few are...

. It is known only from mile-long Nicollet Creek in the Mississippi River

Mississippi River

The Mississippi River is the largest river system in North America. Flowing entirely in the United States, this river rises in western Minnesota and meanders slowly southwards for to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains...

's headwaters in Itasca State Park

Itasca State Park

Itasca State Park is a state park of Minnesota, United States, and contains the headwaters of the Mississippi River. The park spans of northern Minnesota, and is located about north of Park Rapids, Minnesota and from Bagley, Minnesota...

, Minnesota

Minnesota

Minnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...

. It was discovered by Glenn Wiggins, a scientist from the Royal Ontario Museum

Royal Ontario Museum

The Royal Ontario Museum is a museum of world culture and natural history in Toronto, Ontario, Canada. With its main entrance facing Bloor Street in Downtown Toronto, the museum is situated north of Queen's Park and east of Philosopher's Walk in the University of Toronto...

, on New Year's Eve of 1974, and was scientifically described by him in the following year. Unlike other caddisflies, its adult emergence occurs in the winter.