megacanthus, Ancistrus Widholzer [R. L.], Borsoi [J.], Reis [R. E.] & Lehmann A. [P.] 2024:4, Figs. 1-2 [Neotropical Ichthyology v. 22 (no. 1): e230078; ref. 40848] Rio Vacacaí on road RS-630, tributary to rio Jacuí, laguna dos Patos system, São Gabriel, Rio Grande do Sul, Brazil, 30°27'18"S, 54°22'26"W. Holotype: MCP 19582. Paratypes: MCP, MZUSP, UFRGS. •Valid as Ancistrus megacanthus Widholzer, Borsoi, Reis & Lehmann A. 2024. Current status: Valid as Ancistrus megacanthus Widholzer, Borsoi, Reis & Lehmann A. 2024. Loricariidae: Hypostominae. Distribution: South America: Jacuí River drainage, Laguna dos Patos system, Rio Grande do Sul, Brazil. Habitat: freshwater.
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