Insecta, Ephemeroptera: range extensions and new Iowa state records

A comprehensive inventory of the mayflies (Ephemeroptera) occurring in the state of Iowa was given by McCafferty et al. (2003), as part of a series on the mayfly fauna of the Great Plains of the U.S.A. Other completed studies in this series have included Nebraska (McCafferty et al. 2001) and North Dakota (Guenther and McCafferty 2005), and South Dakota is in preparation at this time. McCafferty et al. (2003) listed 106 species from Iowa; however, taxonomic revisions, new collections, and errors discovered since then require updating of the list of Iowa mayflies as follows: Due to recent revisions, two species must be deleted from the Iowa list. These include Procleon irrubrum Lowen and Flannagan because it was synonymized with P. viridoculare (Berner), which was already known from Iowa (Wiersema and McCafferty 2004), and Ephemerella inermis Eaton because it was synomyzed with E. excrucians Walsh, which was already known from Iowa (Jacobus and McCafferty 2003). Another synonym that involves Iowa mayflies is that of Centroptilum walshi McDunnough with C. album, although this does not affect the number of species, because only C. walshi was recorded from Iowa. The only other necessary deletion involves Serratella molita (McDunnough), which we have determined was based on a misidentification of immature larvae of Ephemerella needhami McDunnough, a species that was already known from Iowa. Generic recombinations that involved Iowa species since McCafferty et al. (2003) were Wang and McCafferty (2004) as regards Maccaffertium Bednarik [i.e., all previous Stenonema Traver species transferred except S. femoratum (Say)], and McCafferty et al. (2005) as regards Heterocloeon McDunnough [i.e., Acentrella ampla Traver is now H. amplum (Traver)]. These works affected Iowa species names but not numbers. Published additions to the known fauna included Heterocloeon anoka (Daggy) (McCafferty et al. 2004) and C. triangulifer (McDunnough) (Wiersema and McCafferty 2004).