Journal Article

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

Mohindra, Vindhya, Chandra, Suresh, Gupta, Braj Kishor, Lal, Kuldeep K., Easawarn, Suresh, Singh, Rajeev K., Jena, Joykrushna, Dwivedi, Arvind K.

2017

Overview

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.

• Publisher: Springer International Publishing,Springer,Springer Nature B.V
• Subject: Biogeography / Biomedical and Life Sciences / Catfish / Cladistic analysis / Cryptic species / Dentition / Deoxyribonucleic acid / Discovery and exploration / DNA / DNA sequencing / Ecology / Fossils / Freshwater & Marine Ecology / Freshwater fishes / Life Sciences / Morphology / Myanmar / New species / Nucleotide sequence / nucleotide sequences / Pangasiidae / Pangasius pangasius / Pangasius silasi / Patches (structures) / Phylogeny / Primary Research Paper / Rivers / Sequencing / South Asia / Species / Teeth / Vertebrae / Zoology