lithurgicus, Ancistrus Eigenmann [C. H.] 1912:241, Fig. 36, Pl. 25 (fig. 3) [Memoirs of the Carnegie Museum v. 5 (no. 1); ref. 1227] Crab Falls, Essequibo River, Guyana [approximately 5.403128, -58.820068]. Holotype: FMNH 53091 [ex CM 1524]. Paratypes: (15) BMNH 1911.10.31.107-108 (2); CAS 64613 [ex IU 11950] (4); FMNH 7413 (1), 53092 (4); MCZ 30051 [ex CM 1525 or IU 11950] (1); CAS-SU 21904 (1); USNM 66104 [ex CM 1525] (1). Type catalog: Henn 1928:83 [ref. 12305], Böhlke 1953:45-46 [ref. 12291], Ibarra & Stewart 1987:8 [ref. 12367], Ferraris & Vari 1992:25 [ref. 19771], Ferraris 2007:222 [ref. 29155].. Appeared first as name only in Eigenmann 1910:409 [ref. 1224]. •Valid as Ancistrus lithurgicus Eigenmann 1912 -- (Isbrücker 1980:70 [ref. 2303], Burgess 1989:437 [ref. 12860], Isbrücker 2001:25 [ref. 25653], Isbrücker 2002:12 [ref. 27178], Fisch-Muller in Reis et al. 2003:376 [ref. 27061], Ferraris 2007:222 [ref. 29155], de Souza et al. 2019:27 [ref. 36504], Taphorn et al. 2022:50 [ref. 41297]). Current status: Valid as Ancistrus lithurgicus Eigenmann 1912. Loricariidae: Hypostominae. Distribution: South America: Essequibo and Berbice River basins (Guyana) endemic. Habitat: freshwater.