Summary
The lateral canal of the eye- and pigment-reduced cave populations of Astyanax mexicanus shows fragmentations. This is in contrast with the epigean ancestor and is attributed to the loss of its biological function.
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Wilkens, H. Die Rudimentation des Rumpfkanals bei kavernikolen Populationen des Astyanax (Characidae, Pisces). Experientia 33, 604–605 (1977). https://doi.org/10.1007/BF01946524
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DOI: https://doi.org/10.1007/BF01946524