armstrongi, Hemigrammus Schultz [L. P.] & Axelrod [H. R.] 1955:5, Fig. (p. 4) [Tropical Fish Hobbyist v. 3 (no. 3) (for Jan.-Feb. 1955); ref. 12112] Near Georgetown, Guyana. Holotype: USNM 163868. Paratypes: USNM 163869 (20). Type catalog: Vari & Howe 1991:24 [ref. 19022]. •Synonym of Hemigrammus rodwayi Durbin 1909 -- (Lima & Oyakawa in Reis et al. 2003:133 [ref. 27061], Carvalho et al. 2010:253 [ref. 30862], Zarske 2011:10 [ref. 31376]). Current status: Synonym of Hemigrammus rodwayi Durbin 1909. Characidae: Stethaprioninae. Habitat: freshwater.