(6) Physocypria pelagica (Brehm, 1932) comb. nov.

There is much confusion surrounding Cypria pelagica Brehm, 1932 – here referred to as Physocypria pelagica (Brehm, 1932) comb. nov. – known from Central America, and Cypria pelagica Klie, 1932, recorded from Indonesia and India. The taxonomic history of both species is briefly described here. Cypria pelagica Brehm, 1932 was rudimentarily described from Lake Petén Itzá in Guatemala, with a more detailed description presented later by the same author (Brehm 1932, 1939). Ferguson et al. (1964) argued that the original description of Cypria pelagica Brehm was insufficient and therefore considered – but incorrectly so – the name of Brehm (1932) a nomen nudum and consequently introduced a new name for the species: Cypria petenensis Ferguson et al., 1964 . More recently, upon examining topotype specimens of Cypria pelagica from Lake Petén Itzá, Pérez et al. (2010) and Cohuo et al. (Online Resource 1 of 2017b) emphasized the presence of marginal tubercles on the right valve, which is a character of the genus Physocypria sensu Meisch (2000) . The species is therefore here transferred to the latter genus as Physocypria pelagica (Brehm, 1932) comb. nov. Martens & Savatenalinton (2011) pointed out that Cypria pelagica Brehm, 1932 has priority over its homonym Cypria pelagica Klie, 1932 – originally described as Cypria javana pelagica Klie, 1932 - and consequently introduced a new name for the latter species, Cypria kliei Martens & Savatenalinton, 2011, which is therefore the valid name of that species.