New Records of the Cryptogenic Soft Coral Genus <i>Stragulum</i> (Tubiporidae) from the Eastern Caribbean and the Persian Gulf
Kaveh Samimi-Namin | Leen P. van Ofwegen | Bert W. Hoeksema | Lucy C. Woodall | Melanie Meijer zu Schlochtern | Catherine S. McFadden
The monotypic soft coral genus <i>Stragulum</i> van Ofwegen and Haddad, 2011 (Octocorallia: Malacalcyonacea: Tubiporidae) was originally described from Brazil, southwest Atlantic Ocean. Here, we report the first records of the genus from the eastern Caribbean and the Persian Gulf in the northwest Indian Ocean. We compare the morphological features of specimens, together with molecular data from three commonly used barcoding markers (<i>COI</i>, <i>mtMutS</i>, <i>28S rDNA</i>) and 308 ultraconserved elements (UCE) and exon loci sequenced using a target-enrichment approach. The molecular and morphological data together suggest that specimens from all three localities are the same species, i.e., <i>Stragulum bicolor</i> van Ofwegen and Haddad, 2011. It is still not possible to establish the native range of the species or determine whether it may be an introduced species due to the limited number of specimens included in this study. However, the lack of historical records, its fouling abilities on artificial substrates, and a growing number of observations support the invasive nature of the species in Brazilian and Caribbean waters and therefore suggest that it may have been introduced into the Atlantic from elsewhere. Interestingly, the species has not shown any invasive behaviour in the Persian Gulf, where it has been found only on natural, rocky substrates. The aim of the present report is to create awareness of this taxon with the hope that this will lead to new records from other localities and help to establish its native range.
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