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Multiple cryptic species in the blue-spotted maskray (Myliobatoidei: Dasyatidae: Neotrygon spp.) : an update

Abstract : Previous investigations have uncovered divergent mitochondrial clades within the blue-spotted maskray, previously Neotrygon kuhlii (Müller and Henle). The hypothesis that the blue-spotted maskray may consist of a complex of multiple cryptic species has been proposed, and four species have been recently described or resurrected. To test the multiple-cryptic species hypothesis, we investigated the phylogenetic relationships and coalescence patterns of mitochondrial sequences in a sample of 127 new individuals from the Indian Ocean and the Coral Triangle region, sequenced at both the CO1 and cytochrome b loci. The maximum-likelihood (ML) tree of concatenated CO1+cytochrome b gene sequences, rooted by the New Caledonian maskray N. trigonoides yielded 9 strongly supported, main clades. Puillandre's ABGD algorithm detected gaps in nucleotide distance consistent with the ML phylogeny. The general mixed Yule-coalescent algorithm partitioned the dataset into putative species generally consistent with the ML phylogeny. Nuclear markers generally confirmed that distinct mitochondrial clades correspond to genetically isolated lineages. The 9 main lineages identified by ML analysis were geographically distributed in a parapatric fashion, indicating reproductive isolation. The hypothesis of multiple cryptic species is thus validated.
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Submitted on : Tuesday, September 27, 2016 - 6:11:18 PM
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Philippe Borsa, Kang-Ning Shen, Irma S. Arlyza, Thierry B. Hoareau. Multiple cryptic species in the blue-spotted maskray (Myliobatoidei: Dasyatidae: Neotrygon spp.) : an update . Comptes Rendus Biologies, 2016, 339, pp.417-426. ⟨10.1016/j.crvi.2016.07.004⟩. ⟨ird-01372912⟩



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