Ephemeroptera: Baetidae of Gunnison County, ColoradoAcentrella insignificans(McDunnough) 1926Updated 3 June 2008
TSN 568572
DescriptionLarvae are 2-tailed, the center filament is a stub of one or two segments. Legs have a dense row of long fine setae. Being two-tailed with hind wing pads, makes them similar to Baetis bicaudatus. Their labial palp lacks a thumb and they have long setae on their legs which separates Acentrella insignificans from B. bicaudatus. The hind wing pads separate them from A. turbida.Life HistoryLocations CollectedGunnison River and Taylor River above Taylor Reservoir.NotesPreviously referred to as Baetis insignificans. Common in western Colorado and across the western United States.LinksOn this website:Acentrella turbida Acentrella 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/34.htm ReferencesHarper, P.P. and F. Harper. 1997 Mayflies (Ephemeroptera) of the Yukon. Pp. 152-167 In: H.V. Danks and J.A. Downes, eds. Insects of the Yukon. Biological Survey of Canada (Terrestrial Arthropods). Ottawa, Ontario, Canada.McCafferty,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 254: "This species is known throughout the west. Although it is known from all physiographic regions of Colorado, it is a particularly common mayfly in far western Colorado streams and rivers. " McDunnough,J 1926 New Canadian Ephemeridae with notes. IV. Canadian Entomologist 58:296-303. Described as Baetis insignificans. 
Waltz RD; McCafferty WP. 1987. Systematics of Pseudocloeon, Acentrella, Baetiella, and Liebebiella, new genus (Ephemeroptera: Baetidae). Journal of the New York Entomological Society 95:553-568. Ward,JV; Stanford,JA 1990 Ephemeroptera of the Gunnison River, Colorado, USA. In: Mayflies and Stoneflies. Ed: Campbell,IC Kluwer Academic Publishers,215-220. They found this species in the Gunnison River. The United States Geological Survey (USGS) National Water Quality Assessment Data Warehouse (NAWQA) shows this species is present in Gunnison County. Data as of 1Sep2005 Brown, Wendy S. 2004 Mayflies (Ephemeroptera) of Gunnison County, Colorado, USA www.gunnisoninsects.org |