Figure 4. Bar charts plotting mean p in Operational criteria for cryptic species delimitation when evidence is limited, as exemplified by North American Entomobrya (Collembola: Entomobryidae)

Figure 4. Bar charts plotting mean p-distances (uncorrected) of cytochrome c oxidase I (COI; complete gene, 1539 bp). A, mean intrapopulation, interpopulation, and interspecific distances for all Entomobrya species comparisons. Mean intrapopulation distances and mean distances for comparisons between allopatric populations of the same colour form, different colour forms (i.e. a−b represents mean distance of all comparisons between colour forms a and b), and morphologically differentiated sister species, are graphed for each test species; B, Entomobrya assuta; C, Entomobrya clitellaria; D, Entomobrya ligata; and E, Entomobrya quadrilineata. The line representing the lowest reported interspecific COI distance for Collembola (8%) is highlighted in bold. The number of comparisons (n) for each mean distance is listed. Error bars indicate the SD. See Table S4 for actual mean p-distance values.