Home | Stonefly Nymph Key | Species List | Bibliography | Glossary

Stoneflies - Plecoptera: Perlodidae

Isogenoides zionensis - Zion Springfly

Hanson 1949
Updated 5 August 2017
TSN 103133


John Sandberg has posted a mov file of I. zionensis drumming on his website.

Life History

Sandberg and Stewart have published "Life History of the stonefly Isogenoides zionensis..." Available free online:     http://www2.pms-lj.si/illiesia/papers/Illiesia01-04.pdf

Good Links

On this website:
Key to Perlodidae Nymphs
Introduction to Isogenoides

Other Websites:


Baumann,RW 1973 Studies on Utah stoneflies (Plecoptera) Western North American Naturalist 33(2) 91-108. PDF
     Abstract Fragment: "... Descriptions are given of the female, nymph, and egg of Isogenoides zionensis Hanson and an allotype female designated. ... Descriptions are either supported with original figures or reference is made to acceptable figures in the literature. Besides line drawings and halftones, useful photographic figures are provided which were prepared by using a scanning electron microscope."

Baumann,RW, Gaufin,AR and Surdick,RF 1977 The stoneflies (Plecoptera) of the Rocky Mountains. Memoirs of the American Entomological Society 31, 1-208.
     Quote from page 128: "Nymphs are sometimes common in creeks and rivers in the Southern Rockies, but few adults have been collected. The adults emerge in May and June. "

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

Fuller,RL; Stewart,K,W 1977 The food habits of stoneflies (Plecoptera) in the Upper Gunnison River, Colorado. Environmental Entomology 6, 293-302.

Hanson,JF 1949 Studies on the Plecoptera of North America: V. Notes on Isogenoides. Bulletin of the Brooklyn Entomological Society 44:109-116.
     Describes I. zioensis for the first time.

Kondratieff,BC and Baumann,RW 2002 A review of the stoneflies of Colorado with description of a new species of Capnia (Plecoptera: Capniidae). Transactions of American Entomological Society 128 3, 385-401.
     Quote from page 397: "This species is generally restricted to the silty and warmer West Slope rivers and larger streams of the Plateau, but can be found: Summit Co., Blue River near Silverthorne, 13May1994,N. Voelz,3 males(CSU) and the Rio Conejos (DeWalt and Stewart 1995). "

Maketon,M; Stewart,KW; Kondratieff, BC and Kirchner,RF 1988 New descriptions of drumming and evolution of the behavior in North American Perlodidae (Plecoptera). Journal of the Kansas Entomological Society, pp.161-168.
     Abstract: " The drumming behavior of six Plecoptera species, Clioperla clio, Diploperla robusta, Oconoperla innubila, Osobenus yakimae, Perlinodes aurea and Yugus arinus, are described for the first time, and additional data for Isogenoides zionensis are provided. Patterns and evolution of drumming in the family Perlodidae are discussed, and an out-group comparison shows that: (1) a simple call-answer exchange between sexes in seven species is ancestral, and (2) bi-grouped calls of Hydroperla crosbyi and the complex, grouped exchanges of Isogenoides zionensis are derived expressions of drumming. Similarly, grouped calls of some Isoperla and grouped bi-beat calls of Calliperla luctuosa and Kogotus modestus are derived. The grouped drumming pattern is known only in Perlodidae, and the European Leuctra pseudosignifera (Leuctridae)."

Sandberg,JB and Stewart,KW 2004 Capacity for extended egg diapause in six Isogenoides Klapálek species (Plecoptera: Perlodidae). Transactions of the American Entomological Society 130(4): 411-423. PDF
     Abstract: "The eggs of six Isogenoides species have been incubated at a single, approximately simulated, San Miguel River, Colorado, seasonal temperature regime for 2-5 years. Eggs were collected from reared, laboratory-mated females of I. colubrinus, I. doratus, I. elongatus, I. frontalis, I. varians, and I. zionensis. Eggs were held in 8 ml containers and visually examined usually weekly for development and hatch. Only some I. zionensis eggs from a combined first and second mass of a Leopard Creek, Colorado population hatched directly within two weeks, continuing until late September, and resuming mainly May-June the following year; one and two eggs hatched in 2002 and 2004, respectively. I. doratus and I. varians experienced hatch only after an over-summer, 3-4 month diapause, and I. varians again in late August-September during the second year. Populations of I. colubrinus, I. elongatus, I. frontalis and a San Miguel River, Colorado population of I. zionensis began hatching only in the year following deposition, after a 10-12 month diapause. Some hatching of these four species occurred at spring-summer temperatures in subsequent years (2nd, 3rd, 3rd, and 4th years, respectively), with no intervening hatch at winter temperatures. The study confirms extended, usually asynchronous diapause and hatching for from 3 months to 4 years, probably genetically controlled, in the six species, and a great degree of adaptive capacity for diapause in the genus Isogenoides."

Sandberg and Stewart 2005 Life history of the stonefly Isogenoides zionensis (Plecoptera: Perlodidae) from the San Miguel River, Colorado. Illiesia 1(4)21-32.     PDF

Sandberg,JB and Stewart,KW 2005a Vibrational communication (Drumming) of the nearartic stonefly genus Isogenoides (Plecoptera: Perlodidae). Transactions of American Entomological Society 131 1+2, 111-130.
     Has sonogram of drumming duet between male and female on page 130. PDF

Sandberg,JB and Stewart,KW 2005b Holomorphology and systematics of the stonefly genus Isogenoides (Plecoptera: Perlodidae). Transactions of American Entomological Society 131 3+4, 269-345.

Stewart,KW and Stark,BP 2002 Nymphs of North American Stonefly Genera. 2nd edition The Caddis Press, Columbus, Ohio. 510 pages.
     Illustrations of nymph on page 404-405, figures 14.27-14.28

Stewart,KW and Szczytko,SW 1983 Drift of Ephemeroptera and Plecoptera in two Colorado rivers. Freshwater Invertebrate Biology. 2(3)117-131. PDF

Stewart,KW and Zeigler,DD 1984 Drumming behavior of twelve North American stonefly (Plecoptera) species: First descriptions in Peltoperlidae, Taeniopterygidae and Chloroperlidae. Aquatic Insects. 6(1) 49 - 61. Abstract
     Part of abstract: " Drumming of Isogenoides zionensis is the most complex known in the Plecoptera. Male-female exchanges began as interspersed signals, then changed to sequenced 3-way signals. During the interspersed portion male calls consisted of 11 beats in 3-4 groupings, within which the female answer was spaced. "

Ziegler,DD and Stewart,KW 1977 Drumming behavior of eleven Nearctic stonefly (Plecoptera) species Annals of the Entomological Society of America. 70(4): 495-505.


subgenital plate

Brown,WS 2004 Plecoptera of Gunnison County, Colorado