Basis for Former Listing

Protoptila talola (a caddisfly) is known worldwide only from the male holotype collected in 1941 from an unknown locality in Pine County, Minnesota. It has not been relocated despite collecting at a variety of lake and stream habitats within the County (Ludeman 1991; Houghton et al. 2001). Further inventory work is needed to relocate this species and delineate its range. Protoptila talola was listed as a special concern species in Minnesota in 1996.

  Basis for Delisting

Scientists have been unable to rediscover Protoptila talola despite extensive collecting. Recent examination of the only known specimen has indicated that it may actually be an unusual specimen of a similar and much more common species, P. maculata (Spotted Saddle-case Caddisfly). Until it can be confirmed whether it is a distinct species and is still present in Minnesota, a status of special concern is not necessary. Protoptila talola was delisted in 2013.

  References and Additional Information

Barbour, M. T., J. Gerritsen, B. D. Snyder, and J. B. Stribling. 1999. Rapid bioassessment protocols for use in wadeable streams and rivers: periphyton, benthic macroinvertebrates, and fish, Second edition. EPA 841-B-99-002. United States Environmental Protection Agency, Office of Water, Washington, D.C.

Harris, T. L., and T. M. Lawrence. 1978. Environmental requirements and pollution tolerance of Trichoptera. United States Environmental Protection Agency-600/4-78-063.

Hilsenhoff, W. L. 1987. An improved biotic index of organic stream pollution. Great Lakes Entomologist 20:31-39.

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.

Ludeman, J. 1991. A preliminary survey for endemic species, and restricted or disjunct populations of caddisflies in Minnesota. Report submitted to the Minnesota Department of Natural Resources. 7 pp.

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

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.

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