Phyletic relationships indicate that Ephemerella bartoni Allen should be excluded from the subgenus Dannella in order to prevent a polyphyletic and impractical classifica- tion. A classification in the subgenus Eurylophella is more consistent with the species' phyletic relationships.
McCafferty, W. P.
"A Natural Subgeneric Classification of Ephemerella Bartoni and Related Species (Ephemeroptera: Ephemerellidae),"
The Great Lakes Entomologist, vol 11
Available at: https://scholar.valpo.edu/tgle/vol11/iss3/4