Species that contain: Hemigrammus and unilineatus [ 2 ] records

cayennensis, Hemigrammus unilineatus Géry [J.] 1959:248, Fig. 1 [Bulletin Mensuel de la Société Linnéenne de Lyon v. 28 (no. 8); ref. 10038] Small freshwater stream on Cayenne Island, French Guiana. Holotype: MHNG 2179.061. Paratypes: (10) ANSP 94715 (1), SMF 5385 (1), USNM 179757 (2), ZMA 101049 (1). Type catalog: Nijssen et al. 1982:19 [ref. 19236], Böhlke 1984:44 [ref. 13621], Vari & Howe 1991:25 [ref. 19022], Weber 1998:7 [ref. 32707]. •Valid as Hemigrammus cayennensis Géry 1959 -- (Géry et al. 1991:59 [ref. 21021]). •Synonym of Hemigrammus unilineatus (Gill 1858), but a valid subspecies -- (Planquette et al. 1996:282 [ref. 22818]). •Synonym of Hemigrammus unilineatus (Gill 1858) -- (Weitzman & Palmer 1997:237 [ref. 22743], Lima & Oyakawa in Reis et al. 2003:134 [ref. 27061], Carvalho et al. 2017:12 [ref. 35509]). Current status: Synonym of Hemigrammus unilineatus (Gill 1858). Characidae: Stethaprioninae. Habitat: freshwater.

unilineatus, Poecilurichthys Gill [T. N.] 1858:420 [60] [Annals of the Lyceum of Natural History of New York v. 6 (nos 10-13, art. 38); ref. 1750] Trinidad Island, West Indies. No types known. On p. 60 of separate. •Valid as Hemigrammus unilineatus (Gill 1858) -- (Ovchynnyk 1967:29 [ref. 37559], Ortega & Vari 1986:8 [ref. 9708], Weitzman & Palmer 1997:237 [ref. 22743], Lasso et al. 2001:95 [ref. 25928] as cf. lineatus, Lima & Oyakawa in Reis et al. 2003:133-134 [ref. 27061], Mirande 2010:510 [ref. 31006], Phillip et al. 2013:16 [ref. 32896], Sarmiento et al. 2014:46, 184 [ref. 35004], Melo et al. 2016:132 [ref. 34701], DoNascimiento et al. 2017:49 [ref. 35633], Meza-Vargas et al. 2021:18 [ref. 39298], Borstein et al. 2022:16 [ref. 39507]). Current status: Valid as Hemigrammus unilineatus (Gill 1858). Characidae: Stethaprioninae. Distribution: South America: rivers of Trinidad, coastal river basins of Venezuela, and of Guyana, Suriname and French Guiana; Guaporé and Amazon River basins (Brazil, Colombia, Bolivia, Ecuador, French Guiana, Guyana, Peru, Suriname, Trinidad and Tobago, and Venezuela). Habitat: freshwater.