Stoneflies - Plecoptera: Perlodidae of Gunnison County, ColoradoIsoperla phalerata - Rockies Stripetail(Smith, 1917)Updated 23 February 2024
TSN 103027 LinksOn this website:Isoperla Introduction Other Websites: Photos, Map, Museum specimens, DNA - Barcodinglife.org ReferencesBéthoux,O 2005 Wing venation pattern of Plecoptera (Insecta: Neoptera). Illiesia, 1(9):52-81. PDF  DeWalt,RE and Stewart,KW 1995 Life histories of stoneflies (Plecoptera) in the Rio Conejos of southern Colorado. Great Basin Naturalist (55) 1-18. PDF Abstract: "Thirty-one stonefly species representing eight families were collected during the March 1987 to May 1990 study period. Genera represented by more than one species included Capnia, Utacapnia, Taenionema, Suwallia, Triznaka, Isogenoides, and Isoperla. Peak species richness was recorded on or near the summer solstice in 1988 and 1989. Climatic differences between years were reflected in nymphal development and emergence phenology of most species. New or important corroborative life history data are presented for 11 stonefly species of this assemblage. The hyporheic nymphal development of most chloroperlid species limited the number of early instars sampled and our capacity to interpret voltinism. Limited nymphal data suggested a univoltine-slow cycle for Plumiperla diversa (Frison). Adults of Suwallia pallidula (Banks) and S. wardi (Banks) were present for an extended summer period, but the bulk of their respective emergence times was temporally separated. Isogenoides zionensis Hanson, Pteronarcella badia (Hagen), and Pteronarcys californica Newport were all shown for the first time to have a 9-10-mo egg diapause, and all three species have a semivoltine life cycle. Skwala americana (Klapálek) and Isoperla fulva Claassen were further confirmed to have univoltine-slow cycles. Univoltine-fast and univoltine-slow life cycles are reported for the first time in I. phalerata and I. quinquepunctata, respectively. Regression analysis revealed that six of the eight abundant species had extended emergence patterns (slopes of <5%/d), while only two had synchronous patterns. Warmer spring and summer temperatures in 1989 increased the slopes for five of the eight species studied, but did not change their synchrony designation. Nine of 11 abundant species advanced their median emergence date in 1989 over 1988. This and the higher slope values are consistent with a hurried nymphal development and narrower emergence period due to the warmer thermal regime of 1989." Gill,BA Kondratieff,BC and Sandberg,JB 2015 Evaluation of the morphological species concepts of 16 western Nearctic Isoperla species (Plecoptera: Perlodidae) and their respective species groups using DNA barcoding. Illiesia: International Journal of Stonefly Research, 11(11), 130-146. 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. " |