4. Centroptilum Eaton, 1869

Diagnosis.

1) Both mandibles with a row of abundant setae between prostheca and mola; 2) gills present on segment I to VII, all simple and elongated; 3) absence of spines on the lateral margin of abdominal segments; 4) paracercus subequal in length to cerci.

Remarks.

All the specimens we checked from the North-East of Algeria and North Morocco belong to the two recently described species Centroptilum alamiae Kaltenbach, Vuataz & Gattolliat, 2022 (Fig. 4B) and Centroptilum samraouii Kaltenbach, Vuataz & Gattolliat, 2022. Both species are closely related to Centroptilum luteolum ( Müller, 1776) but clearly different both morphologically and genetically (Kaltenbach et al. 2022). The description of the species Centroptilum algiricum Eaton, 1899 was based on male and female imagoes collected close to Tizi-Ouzou (Algeria) (Eaton 1899). According to the shape of the hindwing, especially of its apex, this species should be assigned to Procloeon rather than to Centroptilum and therefore cannot be considered as the winged stage of one of the two new species of Centroptilum (Samraoui et al. 2021c).