ridens, Myliobatis Ruocco [N. L.], Lucifora [L. O.], Díaz de Astarloa [J. M.], Mabragaña [E.] & Delpiani [S. M.] 2012:866, Fig. 1, 2, 5, 7A, 8 [Zoological Studies v. 51 (no. 6); ref. 32313] Bahía Samborombón, San Clemente del Tuyu, Argentina. Holotype: UNMDP 511. Paratypes: Many at MNHN, UNMDP. •Valid as Myliobatis ridens Ruocco, Lucifora, Díaz de Astarloa, Mabragaña & Delpiani 2012 -- (White 2014:149 [ref. 33490], Weigmann 2016:151 [ref. 34211], White & Naylor 2016:437 [ref. 34575] in Myliobatidae, Petry et al. 2016:299 [ref. 34966], White & Last 2016:723 [ref. 35016], Nión et al. 2016:23 [ref. 35565], Carvalho-Filho 2023:324 [ref. 40480], Chiaramonte et al. 2023:208 [ref. 40423]). Current status: Valid as Myliobatis ridens Ruocco, Lucifora, Díaz de Astarloa, Mabragaña & Delpiani 2012. Myliobatidae. Distribution: Southwestern Atlantic: Rio Grande do Sul (Brazil) south to central Argentina Habitat: marine.