“…In contrast to the Algerian river system (Chaib et al, 2013), for instance in the Moroccan Rif region (Kettani and Langton, 2011), Chironominae is the subfamily richest in the number of recorded species. The Cricotopus species are widespread in Algeria and Morocco (Kettani et al, 2001;Chaib et al, 2013), C. bicinctus, C. sylvestris, C. vierriensis and C. trifascia, as well as Polypedilum cultellatum, have not been, or are only rarely noted, in North Tunisia. The North-West Basin fauna stands out with the highest number of species of Orthocladiinae, Tanypodinae and Chironominae (Figure 4).…”