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Since Nomina Insecta Nearctica listed one species of Rondaniella for the Nearctic (R. sororcula), and since the Manual of Neactic Diptera listed one (R. dimidata), I wondered if maybe these two names were synonyms.

After thirty minutes of web surfing on these names I am confused. The "World Diptera Nomenclator" website says there are two Mycetophilids with valid species names sororcula: Exechia sororcula and Mycomya sororcula. They have no record of the name R. sororcula ever being used.

Harvard's website has beautiful photos of Leia sororcula, a name that the World Diptera Nomenclator website said was a junior synonym of Exechia sororcula.

Cedar Creek as you note, Tony, has nice photos from Minnesota USA of R. dimidata, even though Nomina Insecta Nearctica does not list that species, nor any Mycetophilid with the species name dimidata.

It sounds like R. dimidata is the name to go with, and for the moment the listing of Nomina Insecta Nearctica for R. sororcula is unexplained.:o