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<p>The razorfish genus&#xa0;<i>Iniistius</i>&#xa0;(Labridae) presents taxonomic challenges due to morphological variations across life stages. This study provides a confirmed record and a comprehensive account of the Redblotch razorfish,&#xa0;<i>Iniistius twistii</i>, from the Gulf of Mannar, southeastern coast of India, corroborating a previous preliminary report and solidifying its distribution in Indian waters. Five specimens were collected from demersal trawls off Pamban, Tamil Nadu. Molecular analysis of the COI gene fragment confirmed the species identity, revealing 0% genetic divergence from conspecifics in the Philippines and the South China Sea. Phylogenetic reconstruction showed the Indian specimen forming a monophyletic clade with these Pacific populations, while significant genetic distances from congeners (<i>I. bimaculatus</i>&#xa0;8.98%,&#xa0;<i>I. dea</i>&#xa0;10.49%,&#xa0;<i>I. pavo</i>&#xa0;10.8%,&#xa0;<i>I. pentadactylus</i>&#xa0;12.81%) confirmed species boundaries. This integrated approach validates the presence of&#xa0;<i>I. twistii</i>&#xa0;in the Indian Ocean and demonstrates its genetic connectivity across a vast Indo-Pacific range, providing a robust basis for future biogeographic and ecological studies.</p>

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Morphological and Molecular Characterisation of Iniistius twistii (Teleostei: Labridae) from the Gulf of Mannar, India, with Notes on its Distribution

  • 期刊论文

  • 发表日期：

    2026年5月21日

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  • S. Ragul,
  • M. Balaganesan,
  • K. Karuppasamy,
  • R. Durairaja,
  • N. Jayakumar

摘要

The razorfish genus Iniistius (Labridae) presents taxonomic challenges due to morphological variations across life stages. This study provides a confirmed record and a comprehensive account of the Redblotch razorfish, Iniistius twistii, from the Gulf of Mannar, southeastern coast of India, corroborating a previous preliminary report and solidifying its distribution in Indian waters. Five specimens were collected from demersal trawls off Pamban, Tamil Nadu. Molecular analysis of the COI gene fragment confirmed the species identity, revealing 0% genetic divergence from conspecifics in the Philippines and the South China Sea. Phylogenetic reconstruction showed the Indian specimen forming a monophyletic clade with these Pacific populations, while significant genetic distances from congeners (I. bimaculatus 8.98%, I. dea 10.49%, I. pavo 10.8%, I. pentadactylus 12.81%) confirmed species boundaries. This integrated approach validates the presence of I. twistii in the Indian Ocean and demonstrates its genetic connectivity across a vast Indo-Pacific range, providing a robust basis for future biogeographic and ecological studies.