Larval Taxonomy and Distribution of Genus Hydropsyche (Trichoptera: Hydropsychidae) in Northwestern Algeria Author Bemmoussat-Dekkak, Soumya 0000-0002-8723-5501 Laboratoire de Valorisation des Actions de l’Homme pour la Protection de l’Environnement et Applications en Santé publique, Université de Tlemcen, BP 119 13000 Tlemcen, Algérie. & dekkaksoumia @ hotmail. fr; https: // orcid. org / 0000 - 0002 - 8723 - 5501 dekkaksoumia@hotmail.fr Author Abdellaoui-Hassaine, Karima 0000-0002-7568-8132 Laboratoire de Valorisation des Actions de l’Homme pour la Protection de l’Environnement et Applications en Santé publique, Université de Tlemcen, BP 119 13000 Tlemcen, Algérie. & hassaine 69 @ hotmail. com; https: // orcid. org / 0000 - 0002 - 7568 - 8132 hassaine69@hotmail.com Author Sartori, Michel 0000-0003-3397-3397 Musée cantonal de zoologie, Palais de Rumine, Place Riponne 6, 1005 Lausanne, Suisse & Département d’Ecologie et d’Evolution, Université de Lausanne, Biophore, 1015 Lausanne, Suisse & michel. sartori @ vd. ch; https: // orcid. org / 0000 - 0003 - 3397 - 3397 michel.sartori@vd.ch Author Morse, John C. 0000-0003-3187-4045 Department of Plant & Environmental Sciences, Clemson University, Clemson, South Carolina, USA & jmorse @ clemson. edu; https: // orcid. org / 0000 - 0003 - 3187 - 4045 jmorse@clemson.edu Author Zamora-Muñoz, Carmen Departamento de Zoología, Facultad de Ciencias, Universidad de Granada, 18071 - Granada (Spain) text Zootaxa 2021 2021-01-25 4915 4 481 505 journal article 8676 10.11646/zootaxa.4915.4.2 70890c1c-cbf0-4135-9bf3-5e22b64e3cd3 1175-5326 4461519 84122919-0AE3-43BB-AECB-6F3CA0D63629 Hydropsyche obscura Navás 1928 ( Fig. 4 ) Material examined: Chouly Beni Ghazli Wadi ( CH 0): 11 larvae ( UTA , UGS ), including 2 larvae , 28.x.2014 ; 4 larvae , 22.xii.2014 ; 2 larvae , 21.vi.2015 ; and 3 larvae , 17.iii.2017 . Description: Body length of fifth-instar larva ranging from 11.50 mm to 12.00 mm. Pronotum and head dark ( Figs 4A, 4B ) and frontoclypeal apotome with two light anterolateral spots; oral and aboral spots absent ( Fig. 4B ; Table 2 ). Lateral parts of submentum short and wide ( Fig. 4C ); prosternites pigmented ( Fig. 4D ; Table 2 ). Distribution and ecology: It is a North African endemic species; it is restricted to Algeria (in Great Kabylia) and Morocco (in the high Atlas and the Rif). It is considered as a species of high altitudes and cold springs ( Ajakane 1988 ; Bouzidi 1989 ) and appears more associated with streams and small bodies of clean water ( Hajji et al . 2013 ; Hajji 2017 ). Sekhi et al. (2016) recently reported it for Algeria (Kabylia). During our survey, larvae of this species were collected in two high altitude sites KH1 and CH 0 (at 854 and 1065 m a.s.l., respectively), where the water temperatures are 13–17.3 ° C. The species exhibits a rheophilic character since it was found in fast current velocity ( 1.2–1.75 m /s) and cohabited with H. siltalai and H. fezana .