The phylogenetic position of Lygodactylus angularis and the utility of the 16S rDNA gene for delimiting species in Lygodactylus (Squamata, Gekkonidae)
The phylogenetic position of Lygodactylus angularis and the utility of the 16S rDNA gene for delimiting species in Lygodactylus (Squamata, Gekkonidae)
Blog Article
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</style> <![endif]--> <p class="MsoNormal" style="text-align: justify; line-height: normal;"><span style="font-size: 12pt;" lang="EN-US">The African genus <em>Lygodactylus </em>Gray, is composed of about 60 species of diurnal geckos inhabiting tropical and temperate Africa, Madagascar and South America.</span><span style="font-size: 12pt;" lang="EN-US">In this paper we analysed, by means of the mitochondrial </span><span style="font-size: 12pt;" lang="EN-US">16S rDNA gene</span><span style="font-size: 12pt;" lang="EN-US">, the phylogenetic position of one species for which molecular data are lacking, </span><em><span style="font-size: 12pt;" lang="EN-GB">L.angularis</span></em><span style="font-size: 12pt;" lang="EN-GB">.Moreover, we</span><span style="font-size: 12pt;" lang="EN-GB"> </span><span style="font-size: 12pt;" lang="EN-US">compared the intraspecific <em>vs</em> interspecific genetic divergence using an extended dataset (37 species, 160 haplotypes), to determine whether a fragment of the same gene can be useful for species identification and to reveal the possible presence of new cryptic species in the genus.</span><em><span style="font-size: 12pt;" lang="EN-GB">Lygodactylus angularis</span></em><span style="font-size: 12pt;" lang="EN-GB"> resulted in a monophyletic group together with members of the “<em>fisheri</em>” group and of the “<em>picturatus</em>” group.
</span><span style="font-size: 12pt;" lang="EN-GB">Nevertheless, the independence of the “<em>angularis</em>” lineage is supported by the high genetic divergence.Comparison of intraspecific <em>vs</em> interpecific genetic distances highlights that </span><span style="font-size: 12pt;" lang="EN-US">the threshold values useful </span><span style="font-size: 12pt;" lang="EN-GB">for</span><span style="font-size: 12pt;" lang="EN-GB"> </span><span style="font-size: 12pt;" lang="EN-GB">recognising</span><span style="font-size: 12pt;" lang="EN-US"> a candidate new species can be tentatively placed at 7%.We </span><span style="font-size: 12pt;" lang="EN-GB">identified four species that showed an intraspecific divergence higher than or near the 7% threshold: <em>L.capensis </em>(8.7%), <em>L.
gutturalis</em> (9.3%), <em>L.madagascariensis</em> (6.5%) and <em>L.picturatus</em> (8.
1%).Moreover two species, </span><em><span style="font-size: 12pt;" lang="EN-US">L.mombasicus</span></em><span style="font-size: 12pt;" lang="EN-US"> and <em>L.verticillatus </em>are<em> Wooden Car </em>paraphyletic in terms of gene genealogy.</span><span style="font-size: 12pt;" lang="EN-GB">This study shows that a short fragment of the 16S rDNA gene can be an informative tool for species-level taxonomy in the genus <em>Lygodactylus.
</em></span></p>.