Volume 28, Issue 2, Pages R60-R64 (January 2018) Cavefishes  Richard Borowsky  Current Biology  Volume 28, Issue 2, Pages R60-R64 (January 2018) DOI: 10.1016/j.cub.2017.12.011 Copyright © 2017 Elsevier Ltd Terms and Conditions

Figure 1 Phenotypic diversity in Sinocyclocheilus cavefishes. Surface species are on the top row with increasing degrees of cave adaptation further down the column. Troglomorphic traits to look for include microphthalmia (small eyes), the complete loss of external eyes, depigmentation through decreased presence of melanophores, and total loss of melanin pigmentation (center, bottom) Photo: © 2017 Danté Fenolio-www.anotheca.com. Current Biology 2018 28, R60-R64DOI: (10.1016/j.cub.2017.12.011) Copyright © 2017 Elsevier Ltd Terms and Conditions

Figure 2 Hybrids of cave Astyanax mexicanus have restored surface features. (A) An albino male from the Molino cave population. (B) A non-albino female from the Tinaja cave population. (C) A male from a surface population. (D) An inter-cave hybrid female (Tinaja female crossed to a Molino male) exhibits an almost complete reversion to the surface pigmentation. This reversion to wild type in inter-cave hybrids is the result of genetic complementation. Because the various cave populations have adapted to cave life independently, they have accomplished their evolutionary transformations employing different sets of genes. Thus, in the inter-cave hybrid, the non-functional alleles from one parent are complemented by the functional alleles of the other parent, and vice-versa. Complementation in such hybrids is also seen in eye development. Current Biology 2018 28, R60-R64DOI: (10.1016/j.cub.2017.12.011) Copyright © 2017 Elsevier Ltd Terms and Conditions

Figure 3 The waterfall climbing cavefish, Cryptotora thamicola. This species is found in two caves in Northwestern Thailand. It uses its large fan shaped pectoral and pelvic fins to cling to and climb rock even in swiftly flowing water. Photo: © 2017 Danté Fenolio-www.anotheca.com. Current Biology 2018 28, R60-R64DOI: (10.1016/j.cub.2017.12.011) Copyright © 2017 Elsevier Ltd Terms and Conditions