Operational criteria for cryptic species delimitation when evidence is limited, as exemplified by North American Entomobrya (Collembola: Entomobryidae)

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• A study of 13 colour forms in four North American Entomobrya species found seven independent evolutionary lineages, three of them cryptic lineages that colour pattern can tell apart. Genetic divergence did not always match colour pattern, so how useful colour is as a species marker has to be tested for each species. (at Abstract)