platyrhynchus, Syngnathus Duméril [A. H. A.] 1870:571 [Histoire naturelle des poissons ou ichthyologie générale v. 2; ref. 1147] Nuku Hiva, Marquesas Islands. Holotype (unique): MNHN (apparently lost). •Valid as Microphis platyrhynchus (Duméril 1870) -- (Kuiter 2009:271 [ref. 30404]). •Synonym of Microphis argulus (Peters 1855) -- (Dawson 1984:126 [ref. 5879], Dawson 1985:130 [ref. 6541], Haÿ et al. 2023:24 [ref. 40264]). •Synonym of Coelonotus argulus (Peters 1855). Current status: Synonym of Coelonotus argulus (Peters 1855). Syngnathidae: Nerophinae. Habitat: freshwater, brackish.