Coelonotus Peters [W. (C. H.)] 1855:465 Masc. Syngnathus argulus Peters 1855. Type by monotypy. •See Hemimarsupium Kaup 1853. •Synonym of Microphis Kaup 1853, but a valid subgenus Coelonotus -- (Dawson 1984:124 [ref. 5879], Dawson 1985:127 [ref. 6541]). •Valid as Coelonotus Peters 1855 -- (Araga in Masuda et al. 1984:85 [ref. 6441], Kottelat 2013:302 [ref. 32989], Fricke et al. 2018:121 [ref. 35805], Haÿ et al. 2022:275 [ref. 39015]). •Synonym of Microphis Kaup 1853 -- (Dawson 1986:284 [ref. 6201], Ferraris in Reis et al. 2003:591 [ref. 27061], Haÿ et al. 2023:21 [ref. 40264]). Current status: Valid as Coelonotus Peters 1855. Syngnathidae: Nerophinae.