Baetidae (Baetidae, Ephemeroptera) in the Maghreb: state of the art, key, and perspectives Author Gattolliat, Jean-Luc https://orcid.org/0000-0001-5873-5083 Museum of Zoology, Palais de Rumine, Place Riponne 6, CH- 1014 Lausanne, Switzerland & Department of Ecology and Evolution, Biophore, University of Lausanne, CH- 1015 Lausanne, Switzerland jean-luc.gattolliat@vd.ch Author Samraoui, Boudjema https://orcid.org/0000-0002-0608-9021 Laboratoire de Conservation des Zones Humides, University 8 mai 1945, Guelma, Algeria & Department of Biology, University Badji Mokhtar Annaba, Annaba, Algeria Author Benhadji, Nadhira https://orcid.org/0000-0001-9252-8432 Laboratoire de Recherche Valorisation des Actions de L'homme Pour la Protection de L'environnement et Application en Sante Publique, University of Tlemcen, BP 119, 13000 Tlemcen, Algeria & Department of Hydrobiology, Institute of Biology, University of Szczecin, Felczaka street 3 c, 71 - 412 Szczecin, Poland Author Kechemir, Lina Faculte des Sciences agronomiques et des sciences biologiques, University of Mouloud Mammeri, Tizi-Ouzou, Algeria Author Zrelli, Sonia Unit of Hydrobiology, Laboratory of Environment Biomonitoring (LBE), Faculty of Sciences of Bizerta, University of Bizerta, 7021 Jarzouna, Tunisia & Honoris United Universities, Ecole Polytechnique Centrale, Avenue Mohamed V, 1002 Tunis, Tunisia Author El Yaagoubi, Sara https://orcid.org/0000-0003-1860-6433 Laboratory of Ecology, Systematics and Conservation of the Biodiversity, department of Biology, Faculty of Science, University of Abdelmalek Essaadi, Avenue Sebta, 93002 Tetouan, Morocco Author El Moutaouakil, Majida El Alami Laboratory of Ecology, Systematics and Conservation of the Biodiversity, department of Biology, Faculty of Science, University of Abdelmalek Essaadi, Avenue Sebta, 93002 Tetouan, Morocco Author Sartori, Michel https://orcid.org/0000-0003-3397-3397 Museum of Zoology, Palais de Rumine, Place Riponne 6, CH- 1014 Lausanne, Switzerland & Department of Ecology and Evolution, Biophore, University of Lausanne, CH- 1015 Lausanne, Switzerland text ZooKeys 2023 2023-01-13 1139 137 163 http://dx.doi.org/10.3897/zookeys.1139.94586 journal article http://dx.doi.org/10.3897/zookeys.1139.94586 1313-2970-1139-137 57CDA88415C542A39CF789DBC60150C4 2D3F572308DA5BAEA2F11417AE507FD7 9. Procloeon Bengtsson, 1915 Diagnosis. 1) Gills I-VI with simple or double lamellae, if double, the upper lamella much smaller than lower lamella; 2) legs elongated, claw elongated with two rows of small to minute denticles; 3) labial palp conical and truncated; 4) lateral margin of abdominal segments VII-IX with strong spines; 5) paracercus subequal in length to cerci; 6) cerci with strong spines on the outer margin. Remarks. Procloeon stagnicola Soldan & Thomas, 1983 (Fig. 5C ) is rather similar to the European species Procloeon bifidum (Bengtsson, 1912). Old reports of P. bifidum most certainly refer to P. stagnicola . This species possesses gills with single lamellae ( Soldan and Thomas 1983a ). It is widely distributed in the Maghreb. Besides this endemic species, reports of other species of the genus are more problematic. Reports of Procloeon pennulatum (Eaton, 1870) are limited to Morocco (Fig. 5D ). Within this species, morphological comparison between Maghrebian and Central European specimens was still not performed, and no molecular analyses are available. The conspecificity needs to be confirmed by morphological and molecular evidence; the identification is probably mostly based on presence of hindwings and very long claws. Procloeon concinnum (Eaton, 1885) was originally described from Portugal and is only known at the imaginal stage: eggs, larvae and subimagoes remain unknown ( Bauernfeind and Soldan 2012 ). It is unclear which characters allow a reliable assignment of specimens from Morocco to this species, especially at the larval stage ( El Bazi et al. 2017 ; Khadri et al. 2017 ; Mabrouki et al. 2017 ; Guellaf et al. 2021 ). As mentioned above, Centroptilum algiricum Eaton, 1899 should be assigned to Procloeon based to the shape of the hindwing, and may be the imaginal stage of one of the known species of Procloeon ( Samraoui et al. 2021c ).