margareteae, Roeboides Lucena [C. A. S. de] 2003:292, Figs. 5-7 [Iheringia, Série Zoologia (Porto Alegre) v. 93 (no. 3); ref. 27452] Sistema do rio Pindaré-Mearim, lago do Viana, Maranhão, Brazil. Holotype: MZUSP 38722. Paratypes: ANSP 82289 (1), 95879 (2); UFPI 601 (1), 602 (1); MCZ 46787 (1); MZUSP 5102 (1): USNM 119942 (13), 119944 (3). •Valid as Roeboides margareteae Lucena 2003 -- (Ramos et al. 2014:4 [ref. 35321], Melo et al. 2016:375 [ref. 35317], Brito et al. 2018:23 [ref. 36237] as margaretae, Koerber et al. 2022:40 [ref. 39235], Vieira et al. 2023:17 [ref. 40759], Limeira-Filho et al. 2024:5 [ref. 41573]). Current status: Valid as Roeboides margareteae Lucena 2003. Characidae: Characinae. Distribution: South America: Mearim, Itapecuru, Munim and Parnaíba rivers (Maranhão and Piauí, northeastern Brazil). Habitat: freshwater.