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Convergent Adaptations to Cave Life in the Rhamdia Laticauda Catfish Group (Pimelodidae, Teleostei)

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Abstract

The nocturnal Mexican catfish Rhamdia laticauda (Pimelodidae, Teleostei) is the surface sister species of a number of cave species. Comparison between two of them, R. zongolicensis and R. reddelli, reveals an intermediate state of reduction of the biologically functionless eyes, melanin pigmentation and the negative phototactic behavior. The surface species is perfectly adapted to life in darkness. Therefore only few constructive adaptations are developed in the cave species. For survival under conditions of low food supply in the caves the barbels are elongated to improve the senses of taste and touch and more fat can be deposited in the cave fish tissue. Due to convergent evolution the two cave species are morphologically much alike and show only minor diagnostic meristic differences. From geological data it can be concluded that the two cave species started troglobitic evolution at the end of Pleistocene.

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  1. Zoologisches Institut und Zoologisches Museum, Universität Hamburg, Martin-Luther-King-Platz 3, 20146, Hamburg, Germany

    Horst Wilkens

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  1. Horst Wilkens
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Wilkens, H. Convergent Adaptations to Cave Life in the Rhamdia Laticauda Catfish Group (Pimelodidae, Teleostei). Environmental Biology of Fishes 62, 251–261 (2001). https://doi.org/10.1023/A:1011897805681

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