The fine structure of the chromatophores and other non-sensory components of the eye of the blue-eye, Pseudomugil signifer

Aspects of the fine structure of the chromatophores and of other components of the eye of the blue-eye, Pseudomugil signifer, are presented. Comparisons are made with similar structures of the eye of the mosquitofish, Garnbusia affinis. The blue-eye has a well organized argentea but no tapetum. Two types of iridophores and melanophores are identified in the weal tract. The uveal tract also includes another presumed chromatophore, the lipopterinophore and an as yet unidentified cell type provisionally named weal polypodal cell. The blue iris of Pseudomugil is thought to be due to the mode of organization of the irideal type β iridophores.