Hydrobiologia

, Volume 797, Issue 1, pp 351–370 | Cite as

Cryptic diversity in the Indian clade of the catfish family Pangasiidae resolved by the description of a new species

  • Arvind K. Dwivedi
  • Braj Kishor Gupta
  • Rajeev K. Singh
  • Vindhya Mohindra
  • Suresh Chandra
  • Suresh Easawarn
  • Joykrushna Jena
  • Kuldeep K. Lal
Primary Research Paper

Abstract

Among 22 species of the genus Pangasius, distributed in Southeast and South Asia, only one species, Pangasius pangasius, is known to exist in South Asia. Phylogenetic analysis based upon COI and Cytb sequences suggested that the P. pangasius species clade consists of two subclades. Based upon the genetic and the following morphological evidence, we conclude that these DNA sequence based sister subclades represent two distinct species, P. pangasius and an undescribed species from river Krishna, named as P. silasi. Morphologically, P. silasi is differentiated from its congener P. pangasius by a combination of characters, such as vomero-palatal teeth confluent as an uninterrupted curved band (vs two lunate vomero-palatal teeth patches on each side with a wide gap in the center) and vertebral count of 48 (vs 44). For several morphological characters, P. silasi is also distinct from P. myanmar, which is reported from Myanmar and has overlapping distribution with P. pangasius. Finally, the vomero-palatine dentition in P. silasi is distinct from the dentition structures reported for all the other Pangasius species. The biogeographical significance of finding this new species, P. silasi, in a river of the Indian peninsula is also discussed in this report.

Keywords

Pangasius River Krishna DNA sequences Molecular phylogeny Morphology Biogeography 

Supplementary material

10750_2017_3198_MOESM1_ESM.docx (11.1 mb)
Supplementary material 1 (DOCX 11360 kb)

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Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  • Arvind K. Dwivedi
    • 1
  • Braj Kishor Gupta
    • 1
  • Rajeev K. Singh
    • 1
  • Vindhya Mohindra
    • 1
  • Suresh Chandra
    • 1
  • Suresh Easawarn
    • 1
  • Joykrushna Jena
    • 1
  • Kuldeep K. Lal
    • 1
  1. 1.National Bureau of Fish Genetic Resources Canal Ring RoadLucknowIndia

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