Acentronura (subgenus of Hippocampus) Kaup [J. J.] 1853:230 Fem. Hippocampus gracilissimus Temminck & Schlegel 1850. Type by monotypy. •Valid as Acentronura Kaup 1853 -- (Dawson 1984 [ref. 5276], Araga in Masuda et al. 1984:89 [ref. 6441], Dawson 1985:15 [ref. 6541], Dawson 1986:446 [ref. 5650], Paxton et al. 1989:412 [ref. 12442], Gomon et al. 1994:443 [ref. 22532], Paulus 1999:2266 [ref. 24794], Teske et al. 2004:273 [ref. 31602], Paxton et al. 2006:812 [ref. 29073], Stewart 2015:1053 [ref. 34254], Lourie 2016:155 [ref. 34505], Hamilton et al. 2016:Supplement 1 [ref. 35615], Fricke et al. 2018:120 [ref. 35805], Golani & Fricke 2018:48 [ref. 36273], Fricke et al. 2019:91 [ref. 36673], Short & Trnski 2021:816 [ref. 38639]). Current status: Valid as Acentronura Kaup 1853. Syngnathidae: Syngnathinae.