Genus Bola Hamilton, 1822

and Wak Lin, 1938 as a junior synonym of Johnius Bloch, 1793

According to Hanafi et al., (2023) comprehensive review, both Wak Lin (1938) and Bola Hamilton (1822) are junior synonyms, sharing the same type species, Bola coitor Hamilton. These findings were obtained after a thorough analysis of Hamilton’s (1822) monograph and a survey of pertinent literature. Bola coitor exhibits characteristics similar to the type species of the genus Johnius, Johnius carutta Bloch, 1793, including an inferior mouth with undifferentiated teeth in the lower jaw and a hammer-shaped gasbladder, as suggested by Trewavas (1964) and confirmed by Talwar (1969).