Distribution of aquatic beetles from the east of Morocco (Coleoptera, Polyphaga). We present old and new faunistic and distributional data on aquatic Polyphaga (Coleoptera) from the east of Morocco, comprising the Oriental Region and the basin of Moulouya River. A checklist of 91 species belonging to 27 genera and seven families is provided. Ochthebius quadrifossulatus (Hydraenidae) and Pomatinus substriatus (Dryopidae) are new records for the basin of Moulouya River, and Helophorus occidentalis, H. discrepans, H. flavipes, Hydrochus flavipes, Anacena globulus, Enochrus fuscipennis and Hydrobius fuscipes, all belonging to the family Hydrophilidae, and Limnebius furcatus, Ochthebius aeneus and O. merinidicus (all Hydreanidae) are new for the entire studied area of Eastern Morocco. We found a clear dominance of the Palearctic elements, mainly Mediterranean, with a high proportion of Ibero-Maghrebian endemisms. This chorotype pattern is similar to those observed for other macroinvertebrates orders in the same study area.

Bio-ecology of Potamon algeriense (Herbst, 1785) (Crustacea, Decapoda) in eastern Morocco. To contribute to the knowledge of Potamon algeriense bio-ecology in eastern Morocco and the Moulouya watershed, a total of 90 stations were surveyed between 2013 and 2016. Of these, only 14 stations (out of the 90 surveyed) were positive concerning the occurrence of this species, which was found to be limited to the middle and lower watercourses of the Moulouya watershed, and specifically to Oued Za, Zegzel and the lower watercourse of the sub-basin Mouth of the Moulouya. The results of the statistical analyses showed that the main factors influencing the distribution and abundance of Potamon algeriense were temperature, BOD 5 , and conductivity.