Ephemeroptera: Ameletidae of Gunnison County, ColoradoAmeletus sparsatus McDunnough, 1931Updated 4 June 2009
NotesAmeletus aequivocus was synonymized with A. sparsatus.LinksOn this website:Ameletus Introduction Other Websites: Map - Kondratieff, Boris C. (coordinator). 2000. Mayflies of the United States. Jamestown, ND: Northern Prairie Wildlife Research Center Online. (Version 12DEC2003). http://www.npwrc.usgs.gov/resource/distr/insects/mfly/usa/21.htm ReferencesMcCafferty,WP; Durfee,RS; Kondratieff,BC 1993 Colorado mayflies (Ephemeroptera): an annotated inventory. Southwestern Naturalist 38 3, 252-274.The Purdue University Entomological Collection (PERC) has specimens from the Gunnison River. Quote from page 253: Discussed as Ameletus aequivocus. "Until now, this species had been known only from the type material(male adults) from Colorado. Larvae remain unknown, but larvae that have been taken in Colorado and do not fit any other species precisely may prove to be this species. For example, there are distinctive larval specimens in PERC [Purdue Entomology Research Collection] from the Piedra River, Rio Blanco, and Conejos River that are the same but do not fit any presently published description of western Ameletus. Their gill 4 has a subdorsal sclerotized band but no ventral band, and the ventral border possesses 16-19 spines. Their tails are banded, but there is only slight nondescript dorsal and ventral abdominal patterning, and the gills show no distinct tracheation. They are similar to, but still distinct from, Ameletus sp. B of Allen and Chao (1981) from New Mexico, and therefore could be either a) a new species, b) A. falsus (described from Arizonabut unknown as larvae), or even c)A. aequivocus or A. subnotatus (see below), although the distribution would suggest a suthwestern affinity." Quote from page 254, discussed as Ameletus sparsatus. "This species was originally described from Alberta, and the first author has seen specimens from Idaho. Ameletus cooki McDunnough and A. sparsatus can be difficult to distinguish, and the latter may prove to be a junior synonym of the former. McDunnough,J 1931 New species of North American Ephemeroptera. Canadian Entomologist 63, 82-93. 
Zloty,J 1966 A revision of nearctic Ameletus mayflies based on adult males, with descriptions of seven new species (Ephemeroptera: Ameletidae). Canadian Entomologist 128, 293-346. Brown, Wendy S. 2004 Mayflies (Ephemeroptera) of Gunnison County, Colorado, USA
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