Vertebrate corneal epithelium cell plays an important role for imaging, and the cell density, together with the appearance or type of affiliated microstructures, is considered as a result of evolution adapting to alternate terrestrial or aquatic environment. In this paper, we investigated the corneal cells of both larvae and adult amphibious mudskippers Boleophthalmus pectinirostris and Periophthalmus magnuspinnatus, to testify the relationship between morphology and function. The cell density values of the two species were 31,137 and 31,974 cells per mm(2) in larvae and then significantly decreased to 15,826 and 25,954 cells per mm(2) in adult (p < 0.001), respectively, which could be explained as the habitat change from aquatic to different degrees of terrestrial environment. The corneal epithelium cells were ridge type in larvae and differentiated into ridge type and reticular type in adult P. magnuspinnatus and ridge type, reticular type and ridge-reticular type in adult B. pectinirostris. Four kinds of microstructures as microridge, microvilli, microplicae and microhole appeared in both species. The difference of microridge width and its separation indicated that a dense cell connection was requested in a saltier and more terrestrial environment.
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