Keeping Mayfly Central Current

Dentatella coxalis Dentatella coxalis
Rivière-du-Loup, Quebec
Artist: Lu Sun

What's New?

10 August 2023 update: Overlooked synonyms of Procloeon nelsoni are added; the synonymy of Ironodes californicus is edited to show the correct original combination; and the publication date of Ephemerella argo is corrected. Some minor punctuation inconsistencies are fixed.

21 September 2022 update: New records from Alaska extend the ranges for two Baetis species.

8 February 2022 update: After some deep proofreading and data verification, a variety of errors and omissions are corrected. Consequential changes are as follows. The number of species from Canada is increased by 3 to 338, based on overlooked published records of Eurylophella macdunnoughi, Leptophlebia intermedia and Paraleptophlebia strandii. Misspellings of Acentrella alachua, A. turbida, Camelobaetidius mexicanus and Plauditus elliotti are added. The original combination of A. alachua is corrected from Baetis to Pseudocloeon. The range of Callibaetis pallidus is extended northwards, and the ranges of Neoleptophlebia adoptiva and Ephemerella invaria are extended to the northwest.

19 November 2020 update: Historical misspellings involving Baetis tricaudatus, Camelobaetidius musseri and Drunella spinifera are added. A synonymous provisional species name is listed under Cercobrachys fox.

27 March 2020 update: A historical misspelling of Arthroplea bipunctata is added.

14 January 2020 statement: Several genera included in our current lists are recognized either as subgenera or as junior synonyms of other genera in Burian SK. 2019. Chapter 13 Ephemeroptera. Pp. 263-339. In: R. W. Merritt, K.W. Cummins, and M.B. Berg. (eds.). An Introduction to the Aquatic Insects of North America., 5th Edition. Kendall Hunt Publishing, Company, Dubuque, Iowa, 1480 pp. However, the new or reinstated genus-species combinations that would result from these synonymies are not listed in this chapter. Genus-species combinations are listed on Mayfly Central only if they have been explicitly stated in recent, reputable, peer-reviewed publications and only if they follow the International Code of Zoological Nomenclature. The synonymies referenced above created some unpublished combinations in Afghanurus, Stenonema, and Tricorythodes. If only published combinations in these genera were listed here, then inconsistent genus concepts would be followed in the North and Central American lists. Therefore, at this time, we are not listing species of Ableptemetes, Homoleptohyphes, Tricoryhyphes, and Asioplax in Tricorythodes; we are not listing species of Maccaffertium in Stenonema; and we are not listing species of Ecdyonurus and Nixe in Afghanurus. The status of the genus Dentatella has been part of a long-running academic debate. Until a more thorough study of Eurylophella phylogenetics is completed, Dentatella is recognized for D. coxalis (McDunnough, 1926). A neighbor-joining tree based on DNA barcode data [see Webb et al. 2012. PLoS One 7(5): Figure S1] was used to justify the most recent synonymy of Eurylophella and Dentatella in the chapter referenced above. This tree is an unreliable proxy for phylogenetic reconstruction, probably due to long branch attraction; for example, some other species of Ephemerellidae closely related to Dentatella nest within the family Leptophlebiidae [see again Webb et al. 2012. PLoS One 7(5): Figure S1].


Current Update: August 10, 2023

Former Updates:

  • September 21, 2022
  • Feburary 8, 2022
  • November 19, 2020
  • March 27, 2020
  • January 21, 2020
  • April 9, 2019
  • March 27, 2019
  • March 11, 2019
  • November 15, 2018
  • September 4, 2018
  • March 19, 2018
  • September 20, 2017
  • September 13, 2017
  • May 9, 2017
  • April 19, 2017
  • January 11, 2016
  • July 8, 2015
  • February 2, 2015
  • June 17, 2014
  • February 4, 2014
  • July 10, 2013
  • March 12, 2012
  • February 8, 2011
  • March 8, 2010
  • February 26, 2009
  • October 22, 2008
  • August 30, 2006
  • July 19, 2005
  • January 14, 2005
  • July 14, 2004
  • December 12, 2003
  • July 9, 2002
  • January 7, 2002
  • July 19, 2001
  • February 2, 2001
  • September 22, 2000
  • May 12, 2000
  • March 27, 2000
  • August 12, 1999
  • July 6, 1999
  • January 15, 1999
  • February 9, 1998
  • January 10, 1997
  • June 21, 1996
  • September 15, 1995

Staying Current

The documentation provided herein is subject to continuous change and modification as researchers continue to learn more about the species makeup of mayflies in North America, their relationships, and their distribution. The electronic medium, in addition to allowing ideal searching and indexing capabilities, allows the documentation to remain continually current.

Immediate updating is possible as new data are published. The contents will be updated on a continuous basis, at least annually, as of the Current Update, given above. With such a large and detailed documentation, it is possible that inadvertent errors and omissions have occurred, even though every effort has been made to eliminate them. The data presentation has been proofread by mayfly specialists at Mayfly Central and elsewhere.