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Stoneflies - Plecoptera: Perlodidae of Gunnison County, Colorado

Isoperla phalerata - Rockies Stripetail

(Smith, 1917)
Updated 17 Dec 2017
TSN 103027


On this website:
Isoperla Introduction

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


Béthoux,O 2005 Wing venation pattern of Plecoptera (Insecta: Neoptera). Illiesia, 1(9):52-81. PDF

Smith,LW 1917 Studies of North American Plecoptera (Pteronarcinae and Perlodini) Transactions of the American Entomological Society 43(4):433-489. PDF
     Described as Dictyogenus phaleratus.

Stewart,KW and Stark,BP 2002 Nymphs of North American Stonefly Genera. 2nd edition The Caddis Press, Columbus, Ohio. 510 pages.
     Stunning photo of mature nymph on page 110, Figure 6.37.

Szczytko,SW and Stewart,KW 1979c Drumming behavior of four Western Nearctic Isoperla (Plecoptera) species. Annals of the Entomological Society of America 72(6)781-786.
     Abstract: " Drumming was successfully recorded from 4 of 7 reared Isoperla, representing 3 species complexes and 14 western nearctic collection localities. All 4 engaged in 2-way communication. The ♂ Isoperla phalerata (Banks) signal was diphasic, with a ݲ of 13 plus 22 beats, at relatively constant ݲ frequencies of 24.6 and 6.4 ms. The monophasic ♀ answer had a ݲ of 8 beats at 27.1 ms. Mean beats and frequency of the monophasic male Isoperla quinquepunctata (Banks) signal were 9 and 43.3 ms, respectively. Females responded with 2 beats, at a frequency of 6.1 ms, usually beginning after the male 6th beat. Symphonies of combined and overlapped signals of this species were exhibited by laboratory groups. Isoperla mormona (Banks) ♂ had a ݲ of 11 beats with a frequency of 45.9 ms. One ♀ was observed drumming twice but would not cooperate in the drumming chamber. Isoperla fulva. Claassen males tapped 5–6 times with a frequency of 25.9 ms. Females answered with a ݲ of 5 beats at a frequency of 16.3 ms. Signal characteristics were species-specific, although one group of ♀ I. quinquepunctata answered ♂ I. mormona taped signals after the 5th or 6th beat. The 1st 6 ♂ beats in these 2 species exhibited similar frequencies. These females, however, exhibited a mating avoidance response when paired with I. mormona ♂. Drumming behavior serves as additional data input in establishing Plecoptera phylogeny, and corresponded well in this study to morphological species groupings of Isoperla. "

Brown,WS 2012 Stoneflies (Plecoptera) of Gunnison County, Colorado, USA