“…Ecological distribution in the Southeast region of Brazil. Arcella discoides has been identified in different biotopes as mosses, sediments, plankton and aquatic macrophytes of lotic and lentic systems (Fulone et al, 2005;Laut, Silva, Figueiredo Jr., & Laut, 2011;Barbosa et al, 2014, Miranda & Mazzoni, 2015Silva, Oliveira, & Wisniewski, 2017;Lopes et al, 2017). Penard, 1890 (Figure 2: 5, 5a) Deflandre (1928): p. 227-229, figs.…”