guianensis, Acestrorhynchus Menezes [N. A.] 1969:70, 120, Fig. 54 [Arquivos de Zoologia (São Paulo) v. 18 (nos 1-2); ref. 7834] Botanic Garden, trenches in Georgetown with water form the Demerara River, Guyana. Holotype: FMNH 74359. Paratypes: (21) FMNH 53495 (2), 53501-02 (2, 1), 53504 (2); MCZ 20517 (9), 45275 (1 c&s), 45276-77 (2); USNM 194148 (1). Type catalog: Ibarra & Stewart 1987:5 [ref. 12367]. •Valid as Acestrorhynchus guianensis Menezes 1969 -- (Menezes & Géry 1983:590 [ref. 8307], Géry et al. 1991:42 [ref. 21021], Planquette et al. 1996:224 [ref. 22818]). •See Taphorn 1992:104 [ref. 23654]. •Synonym of Acestrorhynchus microlepis (Jardine 1841) -- (Toledo-Piza & Menezes 1996:4 [ref. 22056], Menezes in Reis et al. 2003:232 [ref. 27061], López-Fernández & Winemiller 2003:195 [ref. 27386]). Current status: Synonym of Acestrorhynchus microlepis (Jardine 1841). Acestrorhynchidae: Acestrorhynchinae. Habitat: freshwater.