microcephalus, Odontostilbe Eigenmann [C. H.] in Eigenmann & Ogle 1907:10 [Proceedings of the United States National Museum v. 33 (no. 1556); ref. 1266] Mission de San Francisco, Río Pilcomayo, La Plata system, Bolivia. Holotype: CAS 59790 [ex IU 11086]. Paratypes: CAS 59791 [ex IU 11086a] (1). Information on type locality see Koerber & Terán 2021:138 [ref. 38314]. •Valid as Odontostilbe microcephala Eigenmann 1907 -- (Casciotta et al. 1992:14 [ref. 21059] as microcephalus, Gómez & Chebez 1996:51 [ref. 23791], Butí & Cancino 1999:72 [ref. 25277] as microcephalus, Malabarba in Reis et al. 2003:218 [ref. 27061], López et al. 2003:31 [ref. 27366], Menni 2004:78 [ref. 28131], Bührnheim & Malabarba 2006:193 [ref. 28728], Miquelarena et al. 2008:82 [ref. 29829], Mirande 2010:532 [ref. 31006], Litz & Koerber 2014:12 [ref. 33622], Sarmiento et al. 2014:185 [ref. 35004], Mirande & Koerber 2015:19 [ref. 35117], Nión et al. 2016:28 [ref. 35565], Koerber et al. 2017:30 [ref. 35267], Chuctaya et al. 2018:[12] [ref. 35862], Chuctaya et al. 2020:10 [ref. 37856], Koerber & Terán 2021:138, 140 [ref. 38314], Chuctaya & Malabarba 2024:240 [ref. 40817]). Current status: Valid as Odontostilbe microcephala Eigenmann 1907. Characidae: Cheirodontinae. Distribution: South America: La Plata River basin (Argentina, Bolivia, Paraguay and Uruguay). Habitat: freshwater.