hologymnus, Gastrosteus Regan [C. T.] 1909:436 [Annals and Magazine of Natural History (Series 8) v. 4 (no. 23) (art. 50); ref. 14419] Rome, Italy. Syntypes: BMNH 1852.8.17.19-22 (4). Original genus should have been Gasterosteus. •Synonym of Gasterosteus gymnurus Cuvier 1829 -- (Kottelat 1997:165 [ref. 22952]). •Synonym of Gasterosteus aculeatus Linnaeus 1758 -- (Monod 1973:283 [ref. 7193], Lelek 1987:267 [ref. 22962], Paepke in Bănărescu & Paepke 2002:209 [ref. 25856], Denys et al. 2022:397 [ref. 40085]). Current status: Synonym of Gasterosteus aculeatus Linnaeus 1758. Gasterosteidae. Habitat: freshwater, brackish, marine.