Plecoptera: PerlodidaeIsogenoides elongatus (Hagen)Elongate Springfly
Updated 28 May 2005
Habitat
Nymphs live under stones in riffles.
Life History
Richardson and Gaufin found this species was carnivorous - 65% animal matter, 35% plant material in gut contents. They ate mostly smaller animals such as Simuliidae (black fly) and Chloroperlidae larvae. Ephemeroptera (mayflies) and Trichoptera (cadisflies) were found in smaller numbers.
John Sandberg has posted a wav file (1624 KB) and a mov file (long download over a dialup connection) of I. elongatus drumming on his website.
Locations Collected
Slate River, Lake Fork
Notes
Older publications may refer to this species as Isogenus elongatus.
Links
On this website:
Key to Perlodidae Nymphs
Introduction to Isogenoides
Other Websites:
Map - Kondratieff, Boris C. and Richard W. Baumann (coordinators). 2000. Stoneflies of the United States. Jamestown, ND: Northern Prairie Wildlife Research Center Online. (Version 12DEC2003). http://www.npwrc.usgs.gov/resource/distr/insects/sfly/usa/530.htm
References
Baumann,RW; Gaufin,AR; Surdick,RF 1977 The stoneflies (Plecoptera) of the Rocky Mountains. Memoirs of the American Entomological Society 31, 1-208.
Quote from page 127: " This species is often associated with Isogenoides colubrinus. It is common in rivers and large creeks. The adults emerge from May to July. "
Hagen, HA, 1874 Report on the Pseudo-neuroptera and Neuroptera collected by Lieut. W.L. Carpenter in 1873 in Colorado. Annual Report of the U.S. Geological and Geographical Survey of the Territories, embracing Colorado, 7: 571-577.
Described as Isogenus elongatus.
Klapálek, Frantisek 1912 Plécoptères. I. Fam. Perlodidae; [monographische Revision. II. Fam. Perlidae; Subfam. Perlinae, Subfam. Neoperlinae; mongraphische Revision] Series Sélys-Longchamps, Edmond de, baron, 1813-1900. Collections zoologiques; catalogue systematique et descriptif, fasc. 4, pt. 1-2.
Discussed as Isogenoides elongatus.
Kondratieff,BC; 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: "Historically, this species occurred in several Front Range rivers, such as the Cache la Poudre and South Platte, but has apparently been extirpated by irrigation practices and pollution. This species is common in the midlle portion of the Colorado River (Eagle and Garfield counties) and the Gunnison River (Delta Co.), and can be found in the larger streams of the Mountain and Plateau regions. "
Richardson,JW; Gaufin,AR 1971 Food habits of some western stonefly nymphs. Transactions of American Entomological Society 97, 91-121.
Discussed as Isogenus elongatus.
Sandberg, J.B. and K.W. Stewart. 2004 Capacity for extended egg diapause in six Isogenoides Klapálek species (Plecoptera: Perlodidae). Trans. Amer. Entomol. Soc. 130(4): 411-423.
Sandberg,JB; Stewart,KW 2005 Holomorphology and systematics of the stonefly genus Isogenoides (Plecoptera: Perlodidae). Transactions of American Entomological Society 131 3+4, 269-345.
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