Table 3. Interspecific divergences (% difference, K2P distance) among COI MtDNA partial sequences of nine species of North American Heptagenia. If a comparative pair included at least one species for which multiple sequences were obtained, the mean value of distances between two sequences from the two species in a combination was used.
| Species | H. elegantula | H. diabasia | H. culacantha | H. solitaria | H. flavescens | H. marginalis | H. whitingi | H. adaequata | H. nr townesi |
|---|---|---|---|---|---|---|---|---|---|
| H. elegantula | |||||||||
| H. diabasia | 1.1 | ||||||||
| H. culacantha | 17 | 16.8 | |||||||
| H. solitaria | 12.1 | 12.3 | 16.9 | ||||||
| H. flavescens | 15.3 | 15.1 | 14.6 | 16.7 | |||||
| H. marginalis | 16.2 | 15.8 | 19.6 | 17.2 | 19.4 | ||||
| H. whitingi | 16 | 15.8 | 14.8 | 16.9 | 11.7 | 19.7 | |||
| H. adaequata | 11.2 | 11.6 | 18 | 15.1 | 14.8 | 17.9 | 17.3 | ||
| H. nr townesi | 16.5 | 16.5 | 18 | 17.8 | 18.7 | 9 | 19.2 | 18.2 |