Untangling the taxonomic ambiguities of the spotted seerfish Scomberomorus guttatus with the description of a new species from India

EM Abdussamad, T Toji, AMR Margaret… - Journal of Fish …, 2024 - Wiley Online Library
EM Abdussamad, T Toji, AMR Margaret, KG Mini, KM Rajesh, PA Azeez, V Ramar
Journal of Fish Biology, 2024Wiley Online Library
Scomberomorus guttatus has been subjected to a series of synonym assignations over the
years. Its taxonomy has been mired with ambiguities due to the greater‐than‐average
morphological variations observed in samples from different regions. An integrated
taxonomic revision with molecular support indicated that the species that was thought to be
a single entity, in reality, is a complex of three distinct species. They are morphologically
distinct with respect to the body depth and elongation, cephalic morphometry, and meristic …
Abstract
Scomberomorus guttatus has been subjected to a series of synonym assignations over the years. Its taxonomy has been mired with ambiguities due to the greater‐than‐average morphological variations observed in samples from different regions. An integrated taxonomic revision with molecular support indicated that the species that was thought to be a single entity, in reality, is a complex of three distinct species. They are morphologically distinct with respect to the body depth and elongation, cephalic morphometry, and meristic characteristics. Otolith morphometry and phylogenetic evidence further established the taxonomic divergence within the spotted seerfish complex. The phylogenetic characteristic as indicated by the mitochondrial Cytochrome c Oxidase subunit I (COI) sequence unveiled that S. guttatus had a high intraspecific divergence of 11.1% from its two identical congeners and a divergence of 2.34% between the congeners, indicating scope for categorizing them as separate species. Based on the morphological and molecular evidence, S. guttatus is redescribed; the senior synonym Scomberomorus leopardus is resurrected as a valid species; and a new species Scomberomorus avirostrus n. sp. is described with keys for species distinction.
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