matei, Hemigrammus Eigenmann [C. H.] 1918:152, Pl. 19 (fig. 1) [Memoirs of the Museum of Comparative Zoology v. 43 (pt 2); ref. 1240] Argentina [aquarium specimen]. Holotype: CAS 44436 [ex IU 11438]. Additional material or paratype: CAS 44437 [ex IU 11438] (1). Appeared first in Eigenmann 1910:436 [ref. 1224] without description. •Valid as Hemigrammus matei Eigenmann 1918 -- (Lima & Oyakawa in Reis et al. 2003:132 [ref. 27061], López et al. 2003:26 [ref. 27366] as mattei, Menni 2004:77 [ref. 28131] as mattei, Marinho et al. 2008:58 [ref. 29547], Mirande & Koerber 2015:26 [ref. 35117]). •Species inquirenda -- (Lima & Marinho 2024:181 [ref. 40817]). Current status: Uncertain as Hemigrammus matei Eigenmann 1918. Characidae: Stethaprioninae. Distribution: South America: Argentina [if valid]. Habitat: freshwater.