Rare Species Guide

  Basis for Former Listing

The Colonizing Microcaddisfly (Hydroptila novicola) is known in Minnesota from approximately 30 localities in the northeastern portion of the state, most recently in 2001. These occurrences are disjunct from the other known populations of this species in the northeastern and southeastern United States. Further inventory work is needed to find additional populations of Colonizing Microcaddisfly and delineate its range in the state. The Colonizing Microcaddisfly was listed as a special concern species in Minnesota in 1996.

  Basis for Delisting

Extensive sampling was conducted between 1999-2001 during which time several additional populations of Colonizing Microcaddisfly were found in northern Minnesota. These occurred in a variety of habitats suggesting the species isn't restricted by habitat. Based on these data, The Colonizing Microcaddisfly appears to be more common and widespread in Minnesota than it was once thought to be, making special concern status unnecessary. The Colonizing Microcaddisfly was delisted in 2013.

  References and Additional Information

Houghton, David C. 2012. Biological diversity of the Minnesota caddisflies (Insecta, Trichoptera). ZooKeys 189:1-389.

Houghton, D. C., and R. W. Holzenthal. 2003. Updated conservation status of protected Minnesota caddisflies. The Great Lakes Entomologist 36(1-2):35-40.

Houghton, D. C., R. W. Holzenthal, M. P. Monson, and D. B. MacLean. 2001. Updated checklist of the Minnesota caddisflies (Trichoptera) with geographic affinities. Transactions of the American Entomological Society 127(4):495-512.

Monson, M. P. 1994. The caddisflies (Insecta: Trichoptera) of the Lake Itasca region, Minnesota, and a preliminary assessment of the conservation status of Minnesota Trichoptera. Thesis, University of Minnesota, Saint Paul, Minnesota. 135 pp.

Minnesota Department of Natural Resources. 2012. Statement of need and reasonableness. Division of Ecological and Water Resources, Minnesota Department of Natural Resources, St. Paul. 337 pp.

Wiggins, G. B. 1996. Larvae of the North American caddisfly genera (Trichoptera), Second edition. University of Toronto Press, Ontario, Canada. 457 pp.