Mishina (1966) described a new ostracod species, Darwinula acuta, from the Lower Triassic of the Kostroma Region (Mishina, 1966, text-fig. 3, fig. 2). However this name had been previously used for Darwinula acuta Lev, 1957 from the Upper Permian Deposits of the Nordvick District, Krasnoyarsk Region (Lev, 1957). According to Article 60.3 of the ICZN Code, a junior primary homonym should be replaced by a new replacement name (International…, 1999; Mezhdunarodnyi…, 2004). The name Darwinula oryzalis nom. nov. (from the Latin oryza (rice)) is hereby proposed as a replacement name. The holotype of D. acuta Mishina, 1966 is housed in the Lower Volga Scientific Research Institute of Geology and Geophysics, Saratov, specimen no. 2–07, complete shell; Kostroma Region, village of Shiryaekha, Borehole 4, depth 88.6–89.4 m; Lower Triassic, Induan, Vetluga Group, Vokhma Formation.