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Trichoptera: Apataniidae of Gunnison County, Colorado

Allomyia gnathos

(Ross) 1950
Updated 4 Mar 2015
TSN 116445
The animals on the right were crawling around on the sediment and algae in a small headwaters stream of Copper Creek on 18 July 2007


Allomyia gnathos has a very unique head shape, the top of its head is dished, with a distinct lip.


They are common in smaller streams in the Gothic area. A few are found in the bigger rivers such as the East River and Copper Creek.


Ross 1950 did the last revision of the genus Allomyia as Imania.

Good Links

On this website:
Key to Apataniidae Larvae

Other Websites:
Photos, Map, Museum specimens, DNA - Barcodinglife.org


Alvarez,M and Peckarsky,BL 2013 The influence of moss on grazers in high-altitude streams: food, refuge or both? Freshwater Biology, 58(9) 1982-1994. PDF

Banks,N 1916 A classification of our limnephilid caddice flies. Canadian Entomologist 48: 117-122.
     Describes the genus Allomyia with the key to genera.

Herrmann,SJ; Ruiter,DE and Unzicker,JD 1986 Distribution and records of Colorado Trichoptera. Southwestern Naturalist 31 4, 421-457.
     They note that A. gnathos is found in Gunnison County. Quote from page 438: " Habitat: streams; Altitudinal range: 2713-3616m; Adult collection dates; 19 June to 5 August; Until recently, this species was placed in the genus Imania (Schmid, 1980). This genus and species appears restricted to cold rapid streams of the montane and alpine zones of Colorado."

Ross,HH 1950 Synoptic notes on some nearctic Limnephilid caddisflies (Trichoptera: Limnephilidae). American Midland Naturalist 43 (2) 410-429.
     Described as Imania gnathos.

Schmid, F. 1980 The insects and arachnids of Canada, part 7, The genera of Trichoptera of Canada and adjacent regions. Ontario, In French. 296pp
     Schmid moved Imania gnathos to the genus Allomyia.

Brown, WS 2004 Trichoptera or Caddisflies of Gunnison County, Colorado, USA