formosus, Tetrodon Günther [A.] 1870:283 [Catalogue of the fishes in the British Museum v. 8; ref. 1995] South America. Holotype (unique): BMNH 1855.3.11.5. Original genus should have been spelled Tetraodon. •Valid as Guentheridia formosa (Günther 1870) -- (Bussing & López S. 1994:156 [ref. 23101], Bussing in Fischer et al. 1995:1634 [ref. 22830], Fourriére et al. 2016:451 [ref. 34668], Fricke et al. 2024:681 [ref. 41622], Schmitter-Soto et al. 2025:suppl. Tab. 1, p. 32 [ref. 42574]). Current status: Valid as Guentheridia formosa (Günther 1870). Tetraodontidae. Distribution: Eastern Pacific: southern Mexico south to Ecuador. IUCN (2019): Least Concern. Habitat: marine.