“…Among aquatic invertebrates, the oligochaetes (Clitellata, exclusive of leeches) are well diversified (Creuzé des Châtelliers, Juget, Lafont, & Martin, 2009; Martin, Martinez‐Ansemil, Pinder, Timm, & Wetzel, 2007) and play an essential role in fine sediment bioturbation (Nogaro et al, 2006), nutrient redistribution (Fukuhara & Sakamoto, 1987), and several biogeochemical processes (Anschutz, Ciutat, Lecroart, Gérino, & Boudou, 2012; Chauvet, Giani, & Gessner, 1993). They are sensitive to the chemical water quality (Rodriguez & Reynoldson, 2011; Vivien, Lafont, Werner, Laluc, & Ferrari, 2019) and sediment characteristics (Ragonha & Takeda, 2014) as well as the trophic level of the ecosystem (Armendáriz, Ocón, & Capítulo, 2012). Based on their ecological requirements, species can be assigned to stygoxenes (restricted to surface water and rarely occurring inside hyporheic sediments), stygophiles (living in both surface and hyporheic zones), or stygobites (restricted to groundwater; Marmonier, Vervier, Gibert, & Dole‐Olivier, 1993).…”