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P. exopthalmica is poorly known as the original description was based on a 25 mm and a 9.5 mm ML paralarva. The 9.5 mm ML specimen, taken from the Indian Ocean, was designated as the lectotype (i.e., a "holotype" designated from the original type series) by Glaubrecht and Salcedo-Vargas (2000:274). The 25 mm ML specimen, taken in the North Atlantic, has been placed in the synonomy of P. levimana by Young et al. (in press). The most distinguishing feature of the small lectotype is a slender, unexpanded club, a feature shared with P. levimana. P. exopthalmica may eventually prove to be a junior synonym of P. levimana.