Journal Article
Evolution in the dark: Unexpected genetic diversity and morphological stasis in the blind, aquifer-dwelling catfish Horaglanis
Raghavan, R., Sundar, R.L., Arjun, C.P., Britz, R. and Dahanukar, N.
Record Number:
6066
Year:
2023
Journal:
Vertebrate Zoology
Pages:
57-74
Volume:
73
Notes:
Copyright Rajeev Raghavan et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use,
distribution, and reproduction in any medium, provided credit is given
Abstract:
The lateritic aquifers of the southern Indian state of Kerala harbour a unique assemblage of enigmatic stygobitic fishes which are
encountered very rarely, only when they surface during the digging and cleaning of homestead wells. Here, we focus on one of the
most unusual members of this group, the catfish Horaglanis, a genus of rarely-collected, tiny, blind, pigment less, and strictly aquifer-
residing species. A six-year exploratory and citizen-science backed survey supported by molecular phylogenetic analysis reveals
novel insights into the diversity, distribution and population structure of Horaglanis. The genus is characterized by high levels of
intraspecific and interspecific genetic divergence, with phylogenetically distinct species recovered above a 7.0% genetic-distance
threshold in the mitochondrial cytochrome oxidase subunit 1 gene. Contrasting with this deep genetic divergence, however, is a
remarkable stasis in external morphology. We identify and describe a new cryptic species, Horaglanis populi, a lineage that is the
sister group of all currently known species. All four species are represented by multiple haplotypes. Mismatch distribution reveals
that populations have not experienced recent expansions.
Times Cited:
4
Relevent Species:
Related Records:
Menon, A. G. K. (1950)
On a remarkable blind siluroid fish of the family Clariidae from Kerala, (India)
Menon, A. G. K. (1951)Distribution of clariid fishes, and its significance in zoogeographical studies
Menon, A. G. K. (1951)On certain features in the anatomy of Horaganis Menon
Eapen, K. C. (1963)A new species of Monopterus from South India
Chardon, M. (1968)Anatomie comparee de l'appareil de Weber et des structures connexes chez les Siluriformes
Misra, K.S. (1976)Horaglanis krishnai
Misra, K.S. (1976)Horaglanis krishnai
Misra, K.S. (1976)Horaglanis krishnai
Mercy, T.V.A. (1981)Monographic study of the fish Horaglanis krishnai Menon
Mercy, T.V.A. (1981)On the unique disposition of the valvula cerebelli in Horaglanis krishnai (Teleostei)
Mercy, T.V.A. (1981)On the unique disposition of the valvula cerebelli in Horaglanis krishnai (Teleostei)
Mercy, T.V.A. (1981)Biology of the blind catfish of Kerala, Horaglanis krishnai Menon
Mercy, T.V.A. (1981)Biology of the blind catfish of Kerala, Horaglanis krishnai Menon
Mercy, T.V.A. (1981)Biology of the blind catfish of Kerala, Horaglanis krishnai Menon
Mercy, T.V.A. (1981)On the unique disposition of the valvula cerebelli in Horaglanis krishnai (Teleostei)
Mercy, T.V.A. (1981)Monographic study of the fish Horaglanis krishnai Menon
Mercy, T.V.A. (1981)Monographic study of the fish Horaglanis krishnai Menon
Mercy, T.V.A. (1982)On the presence of a forked barbel in the blind catfish Horaglanis krishnai Menon
Mercy, T.V.A., Padmanabhan, K.G. and Pillai, N.K. (1982)Morphological studies on the oocytes of the blind catfish Horaglanis krishnai Menon
Mercy, T.V.A. (1982)On the presence of a forked barbel in the blind catfish Horaglanis krishnai Menon
Mercy, T.V.A., Padmanabhan, K.G. and Pillai, N.K. (1982)Morphological studies on the oocytes of the blind catfish Horaglanis krishnai Menon
Mercy, T.V.A. (1982)On the presence of a forked barbel in the blind catfish Horaglanis krishnai Menon
Mercy, T.V.A., Padmanabhan, K.G. and Pillai, N.K. (1982)Morphological studies on the oocytes of the blind catfish Horaglanis krishnai Menon
Mercy, T.V.A. (1983)Studies on the air bladder of blind clariid Horaglanis krishnai Menon
Mercy, T.V.A. (1983)Studies on the air bladder of blind clariid Horaglanis krishnai Menon
Mercy, T.V.A. (1983)Studies on the air bladder of blind clariid Horaglanis krishnai Menon
Mercy, T.V A., Pillai, N.K. and Balasubramonian, N.K. (1984)Studies on the oxygen consumption of the blind catfish Horaglanis krishnai
Mercy, T.V A., Pillai, N.K. and Balasubramonian, N.K. (1984)Studies on the oxygen consumption of the blind catfish Horaglanis krishnai
Mercy, T.V A., Pillai, N.K. and Balasubramonian, N.K. (1984)Studies on the oxygen consumption of the blind catfish Horaglanis krishnai
Mercy, T.V.A. and Pillai, N.K. (1984/5)The anatomy and histology of the alimentary tract of the blind cat-fish Horaglanis krishnai
Mercy, T.V.A. and Pillai, N.K. (1984/5)The anatomy and histology of the alimentary tract of the blind cat-fish Horaglanis krishnai
Mercy, T.V.A. and Pillai, N.K. (1984/5)The anatomy and histology of the alimentary tract of the blind cat-fish Horaglanis krishnai
Talwar, P. K. and Jhingran, A. G. (1992)Genus Horaglanis and species Horaglanis krishnai
Talwar, P. K. and Jhingran, A. G. (1992)Genus Horaglanis and species Horaglanis krishnai
Talwar, P. K. and Jhingran, A. G. (1992)Genus Horaglanis and species Horaglanis krishnai
de Pinna, M.C.C. (1993)Higher-levelphylogeny of Siluriformes,with a new classication of the order (Teleostei, Ostariophysi).
de Pinna, M.C.C. (1993)Higher-levelphylogeny of Siluriformes,with a new classication of the order (Teleostei, Ostariophysi).
de Pinna, M.C.C. (1993)Higher-levelphylogeny of Siluriformes,with a new classication of the order (Teleostei, Ostariophysi).
de Pinna, M.C.C. (1998)Phylogenetic relationships of Neotropical Siluriformes (Teleostei: Ostariophysi): Historical overview and synthesis of hypotheses
de Pinna, M.C.C. (1998)Phylogenetic relationships of Neotropical Siluriformes (Teleostei: Ostariophysi): Historical overview and synthesis of hypotheses
de Pinna, M.C.C. (1998)Phylogenetic relationships of Neotropical Siluriformes (Teleostei: Ostariophysi): Historical overview and synthesis of hypotheses
Mercy, T.V.A. (2000)Biology of an endemic blind catfish Horaglanis krishnai Menon
Mercy, T.V.A. (2000)Biology of an endemic blind catfish Horaglanis krishnai Menon
Ponniah, A.G. and Gopalakrishnan, A. (2000)Endemic fish diversity of Western Ghats
Ponniah, A.G. and Gopalakrishnan, A. (2000)Endemic fish diversity of Western Ghats
Ponniah, A.G. and Gopalakrishnan, A. (2000)Endemic fish diversity of Western Ghats
Mercy, T.V.A. (2000)Biology of an endemic blind catfish Horaglanis krishnai Menon
Mercy, T.V.A. and Pillai, N.K. (2001)Studies on the cranial osteology of the blind catfish Horaglanis krishnai menon (Pisces, Clariidae)
Mercy, T.V.A., Pillai, N.K. and Balasubramonian, N.K. (2001)Studies on certain aspects of behaviour in the blind catfish Horaglanis krishnia Menon
Ranjit Daniels, R.J. (2001)Endemic fishes of the Western Ghats and the Satpura hypothesis
Ranjit Daniels, R.J. (2001)Endemic fishes of the Western Ghats and the Satpura hypothesis
Ranjit Daniels, R.J. (2001)Endemic fishes of the Western Ghats and the Satpura hypothesis
Mercy, T.V.A. and Pillai, N.K. (2001)Studies on the cranial osteology of the blind catfish Horaglanis krishnai menon (Pisces, Clariidae)
Mercy, T.V.A., Pillai, N.K. and Balasubramonian, N.K. (2001)Studies on certain aspects of behaviour in the blind catfish Horaglanis krishnia Menon
Mercy, T.V.A. and Pillai, N.K. (2001)Studies on the cranial osteology of the blind catfish Horaglanis krishnai menon (Pisces, Clariidae)
Mercy, T.V.A., Pillai, N.K. and Balasubramonian, N.K. (2001)Studies on certain aspects of behaviour in the blind catfish Horaglanis krishnia Menon
Arratia, G., Kapoor, B.G., Chardon, M. and Diogo, R. (2003)Catfishes
Diogo, R., Chardon, M. and Vandewalle, P. (2003)On the osteology and myology of the cephalic region and pectoral girdle of Heteropneustes fossilis (Siluriformes: Heteropneustidae), with comments on the phylogenetic relationships between Heteropneustes and clariid fishes
Biju, S.D. and Bossuyt, F. (2003)New frog family from India reveals an ancient biogeographical link with the Seychelles
Biju, S.D. and Bossuyt, F. (2003)New frog family from India reveals an ancient biogeographical link with the Seychelles
Biju, S.D. and Bossuyt, F. (2003)New frog family from India reveals an ancient biogeographical link with the Seychelles
Teugels, G.G. and Adriaens, D. (2003)Taxonomy and phylogeny of Clariidae - an overview
Teugels, G.G. and Adriaens, D. (2003)Taxonomy and phylogeny of Clariidae - an overview
Teugels, G.G. and Adriaens, D. (2003)Taxonomy and phylogeny of Clariidae - an overview
Diogo, R., Chardon, M. and Vandewalle, P. (2003)On the osteology and myology of the cephalic region and pectoral girdle of Heteropneustes fossilis (Siluriformes: Heteropneustidae), with comments on the phylogenetic relationships between Heteropneustes and clariid fishes
Arratia, G., Kapoor, B.G., Chardon, M. and Diogo, R. (2003)Catfishes
Diogo, R., Chardon, M. and Vandewalle, P. (2003)On the osteology and myology of the cephalic region and pectoral girdle of Heteropneustes fossilis (Siluriformes: Heteropneustidae), with comments on the phylogenetic relationships between Heteropneustes and clariid fishes
Arratia, G., Kapoor, B.G., Chardon, M. and Diogo, R. (2003)Catfishes
Dahanukar, N., Raut, R. and Bhat, A. (2004)Distribution, endemism and threat status of freshwater fishes of the Western Ghats of India
Bossuyt, F., Meegaskumbura, M., Beenaerts, N., Gower, D.J., Pethiyagoda, R., Roelants, K., Mannaert, A., Wilkinson, M., Bahir, M.M., Manamendra-Arachchi, K., Ng, P.K.L., Schneider, C.K., Oommen, O.V. and Milinkovitch, M.C. (2004)Local endemism within the Western Ghats-Sri Lanka biodiversity hotspot
Babu, K.K.S. and Nayar, C.K.G. (2004)A new species of the blind fish Horaglanis Menon (Siluroidea: Clariidae) from Parappukara (Trichur District) and a new report of Horaglanis krishnai Menon from Ettumanur (Kottayam District), Kerala
Kurup B.M. Radhakrishnan K.V. and Manojkumar T.G. (2004)Biodiversity status of fishes inhabiting rivers of Kerala (S. India) with special reference to endemism, threats and conservation measures
Roelants, K., Jiang, J. and Bossuyt, F. (2004)Endemic ranid (Amphibia: Anura) genera in southern mountain ranges of the Indian subcontinent represent ancient frog lineages: evidence from molecular data
Kurup B.M. Radhakrishnan K.V. and Manojkumar T.G. (2004)Biodiversity status of fishes inhabiting rivers of Kerala (S. India) with special reference to endemism, threats and conservation measures
Bossuyt, F., Meegaskumbura, M., Beenaerts, N., Gower, D.J., Pethiyagoda, R., Roelants, K., Mannaert, A., Wilkinson, M., Bahir, M.M., Manamendra-Arachchi, K., Ng, P.K.L., Schneider, C.K., Oommen, O.V. and Milinkovitch, M.C. (2004)Local endemism within the Western Ghats-Sri Lanka biodiversity hotspot
Babu, K.K.S. and Nayar, C.K.G. (2004)A new species of the blind fish Horaglanis Menon (Siluroidea: Clariidae) from Parappukara (Trichur District) and a new report of Horaglanis krishnai Menon from Ettumanur (Kottayam District), Kerala
Kurup B.M. Radhakrishnan K.V. and Manojkumar T.G. (2004)Biodiversity status of fishes inhabiting rivers of Kerala (S. India) with special reference to endemism, threats and conservation measures
Roelants, K., Jiang, J. and Bossuyt, F. (2004)Endemic ranid (Amphibia: Anura) genera in southern mountain ranges of the Indian subcontinent represent ancient frog lineages: evidence from molecular data
Babu, K.K.S. and Nayar, C.K.G. (2004)Occurence of subterranean blind fish in the laterite area of Kerala State, India
Bossuyt, F., Meegaskumbura, M., Beenaerts, N., Gower, D.J., Pethiyagoda, R., Roelants, K., Mannaert, A., Wilkinson, M., Bahir, M.M., Manamendra-Arachchi, K., Ng, P.K.L., Schneider, C.K., Oommen, O.V. and Milinkovitch, M.C. (2004)Local endemism within the Western Ghats-Sri Lanka biodiversity hotspot
Roelants, K., Jiang, J. and Bossuyt, F. (2004)Endemic ranid (Amphibia: Anura) genera in southern mountain ranges of the Indian subcontinent represent ancient frog lineages: evidence from molecular data
Dahanukar, N., Raut, R. and Bhat, A. (2004)Distribution, endemism and threat status of freshwater fishes of the Western Ghats of India
Babu, K.K.S. and Nayar, C.K.G. (2004)A new species of the blind fish Horaglanis Menon (Siluroidea: Clariidae) from Parappukara (Trichur District) and a new report of Horaglanis krishnai Menon from Ettumanur (Kottayam District), Kerala
Diogo, R. (2005)Morphological evolution, aptations, homoplasies, constraints and evolutionary trends. Catfishes as a case study on general phylogeny and macroevolution
Diogo, R. (2005)Morphological evolution, aptations, homoplasies, constraints and evolutionary trends. Catfishes as a case study on general phylogeny and macroevolution
Diogo, R. (2005)Morphological evolution, aptations, homoplasies, constraints and evolutionary trends. Catfishes as a case study on general phylogeny and macroevolution
Jayaram, K.C. (2006)Catfishes of India
Jayaram, K.C. (2006)Catfishes of India
Jayaram, K.C. (2006)Catfishes of India
Gunawardene, N.R. et al. (2007)A brief overview of the Western Ghats-Sri Lanka biodiversity hotspot
Gunawardene, N.R. et al. (2007)A brief overview of the Western Ghats-Sri Lanka biodiversity hotspot
Gunawardene, N.R. et al. (2007)A brief overview of the Western Ghats-Sri Lanka biodiversity hotspot
Ollier, CD and Sheth, HC (2008)The High Deccan duricrusts of India and their significance for the ‘laterite’ issue
Subhash Babu, K.K. and Sivasankaran, B.N. (2010)The hypogean fauna of selected ecosystems of Kerala, India, with two new records
Subhash Babu, K.K. and Sivasankaran, B.N. (2010)The hypogean fauna of selected ecosystems of Kerala, India, with two new records
Subhash Babu, K.K. and Sivasankaran, B.N. (2010)The hypogean fauna of selected ecosystems of Kerala, India, with two new records
Pati, A.K. and Parganiha, A. (2010)Subterranean fishes of India
Dahanukar, N., Raghavan, R., Ali, A., Abraham, R. and Shaji, C.P. (2011)Chapter 3. The status and distribution of freshwater fishes of the Western Ghats
Dahanukar, N., Raghavan, R., Ali, A., Abraham, R. and Shaji, C.P. (2011)Chapter 3. The status and distribution of freshwater fishes of the Western Ghats
Babu, K.K.S. (2012)Horaglanis abdulkalami, a new hypogean blind catfish (Siluriformes: Clariidae) from Kerala, India
Babu, K.K.S. (2012)Horaglanis abdulkalami, a new hypogean blind catfish (Siluriformes: Clariidae) from Kerala, India
Babu, K.K.S. (2012)Horaglanis abdulkalami, a new hypogean blind catfish (Siluriformes: Clariidae) from Kerala, India
Raghavan, R.., Das, K.., Nameer, P.O., Bijukumar, A. and Dahanukar, N. (2016)Protected area and imperriled endemic freshwater biodiversity in the Westren Ghats hotspot
Raghavan, R.., Das, K.., Nameer, P.O., Bijukumar, A. and Dahanukar, N. (2016)Protected area and imperriled endemic freshwater biodiversity in the Westren Ghats hotspot
Pavan-Kumar, A. (2017)Molecular phylogeny of genus Horaglanis (Indian blind catfishes) within Family Clariidae
Pavan-Kumar, A. (2017)Molecular phylogeny of genus Horaglanis (Indian blind catfishes) within Family Clariidae
Pavan-Kumar, A. (2017)Molecular phylogeny of genus Horaglanis (Indian blind catfishes) within Family Clariidae
Varma, A. (2017)Groundwater resource and governance in Kerala: status issues and prospects
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Mohan, M., Bijoy Nandan, S. and Harikrishnan, M. (2020)Taxonomic notes on subterranean fish collected from Kerala, India
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in the Western Ghats biodiversity hotspot
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in the Western Ghats biodiversity hotspot
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Raghavan, R., Sundar, R.L., Arjun, C.P., Britz, R. and Dahanukar, N. (2023)Evolution in the dark: Unexpected genetic diversity and morphological stasis in the blind, aquifer-dwelling catfish Horaglanis
Raghavan, R., Sundar, R.L., Arjun, C.P., Britz, R. and Dahanukar, N. (2023)Evolution in the dark: Unexpected genetic diversity and morphological stasis in the blind, aquifer-dwelling catfish Horaglanis
Raghavan, R., Sundar, R.L., Arjun, C.P., Britz, R. and Dahanukar, N. (2023)Evolution in the dark: Unexpected genetic diversity and morphological stasis in the blind, aquifer-dwelling catfish Horaglanis
Raghavan, R., Sundar, R.L., Arjun, C.P., Britz, R. and Dahanukar, N. (2023)Evolution in the dark: Unexpected genetic diversity and morphological stasis in the blind, aquifer-dwelling catfish Horaglanis
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Lavoué, S., Jamaluddin, J.A.F., Muhammad-Rasul, A.H., Ilham-Norhakim, M.L. and Zain, K.M. (2024)Mitochondrial evidence on the phylogenetic position of the Southeast Asian catfish genus Encheloclarias Myers, 1937 (Actinopterygii: Siluriformes: Clariidae): Evolutionary and conservation implications
Lavoué, S., Jamaluddin, J.A.F., Muhammad-Rasul, A.H., Ilham-Norhakim, M.L. and Zain, K.M. (2024)Mitochondrial evidence on the phylogenetic position of the Southeast Asian catfish genus Encheloclarias Myers, 1937 (Actinopterygii: Siluriformes: Clariidae): Evolutionary and conservation implications
Lavoué, S., Jamaluddin, J.A.F., Muhammad-Rasul, A.H., Ilham-Norhakim, M.L. and Zain, K.M. (2024)Mitochondrial evidence on the phylogenetic position of the Southeast Asian catfish genus Encheloclarias Myers, 1937 (Actinopterygii: Siluriformes: Clariidae): Evolutionary and conservation implications