Genus Arctodiaptomus Kiefer, 1932

Arctodiaptomus dorsalis probably represents another species complex athough Suárez-Morales & Elías-Gutiérrez (2001) recently synonymized Arctodiaptomus dampfi Brehm from Peten Lake with A. dorsalis, originally described from Louisiana. Barcode analyses indicated that the population of A. dorsalis from Peten Lake (Guatemala) is conspecific with those from the Yucatan, but also revealed the likely occurrence of at least four species in this complex. The population from Lachua Lake ( A. cf. dorsalis 1) showed nearly 7% COI divergence from the Yucatan/ Peten Lake populations. Two additional lineages showing high COI divergence were also collected; the first one from the Sonora desert and the second one from the central region (Fig. 1.5). No morphological characters were found to distinguish these four lineages.