The interstitial stygobiotic isopods of the genus Microcharon (Crustacea) are diversified in Morocco. A new species, M. ourikensis, is described. The new species shows some original characters for this genus: large size, strong elongation in the first male pleopod exopodal inner lobe, 5-dentate mandibular pars incisiva, and 5 spines on the last mandibular palp segment. The species is a member of the Ibero-Maghrebin messoulii group. It is an endemic representative of the Ourika valley groundwater in the Moroccan High Atlas. It derives from a littoral marine ancestor which could have colonized the continental subterranean water during Turonian or Senonian Tethyan regressions.

Additional Metadata
Keywords Taxonomy, biogeography, Crustacea, interstitial Isopoda, Microcharon, High Atlas, Morocco
Journal Contributions to Zoology
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Released under the CC-BY 4.0 ("Attribution") License

Citation
Yacoubi-Khebiza, M, Boulanouar, M, & Coineau, N. (1997). Un nouveau Microparasellidae (Crustacé Isopode) du Haut-Atlas; aspects phylogénétiques et biogéographiques. Contributions to Zoology, 66(4), 227–234.