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This radiation has been linked to various geological events, such as the closure of the Tethys Sea, collision of Australia and proto-New Guinea with southeastern Asia, with continual changes in the availability of new tropical shallow-water habitats causing a postulated rise in the number of reefal associated taxa, such as Hippolyte species. Among these specimens, four genetically distinct taxa can be recognized (Fig. According the S-DIVA and the molecular clock analysis, there was a dispersion event between specimens from the western Atlantic (H. Financial support for this project was provided by research grants from FAPESP (PD 2011/11901-3; Temático Biota 2010/50188-8). The IWP is known as a vast tropical marine species rich hotspot. 1 (morphologically closest to the type specimens redescribed by d’Udekem d’Acoz in 1999) and sp. Based on molecular data it is clear that all three species are valid and very closely related, but they can be distinguished by the combination of geographic distribution and some morphological characteristics. californiensis) in the Miocene (dated 11 ± 3 Myr), evidently before the final closure of Isthmus of Panama, dated 2.8 Myr, and there are clear colour pattern differences between both species (SDG, pers. pleuracanthus specimens from Florida (Atlantic Coast and Gulf of Mexico) with rostra of variable sizes. pleuracanthus now registered on both sides of the Florida peninsula (see Supplementary Table S1). The present phylogenetic analysis indeed corroborates that these forms belong to the same species with negligible differences in their genetic makeup. For this analysis, only the mitochondrial markers were used and the substitution rate was fixed to 0.007 (COI) and 0.004 (16S) based on the divergence rate per one million years (Myr) reported in literature for these markers This study is part of postdoctoral project of the first author, and is carried out within the multidisciplinary research project Temático BIOTA-FAPESP (São Paulo Research Foundation) under the senior author’s responsibility and coordination. For example, many species were, in the past, confused under the name Hippolyte ventricosa H. Milne Edwards, 1837, often considered as occurring across the entire Indo-West Pacific. ventricosa was restricted to the coasts of India and Pakistan. This was the case for: Hippolyte caradina Holthuis, 1947, Hippolyte coerulescens (Fabricius, 1775), Hippolyte lagarderei d’Udekem d’Acoz, 1995, Hippolyte leptometrae Ledoyer, 1969, Hippolyte palliola Kensley, 1970, Hippolyte proteus (Paulson, 1875), Hippolyte ventricosa H. Milne Edwards, 1837 sensu stricto and Alcyonohippolyte tenuicarpus Marin, 2011.
We used these parameters in order to obtain the BAY tree (all markers) and the molecular clock (16S and COI). No studies on the phylogenetic relationships of the closely related genera Hippolyte and Alcyonohippolyte have been published, nor has their relationship to other hippolytid genera been fully resolved. Indeed, few species of the genus Hippolyte have been included in the broader phylogenetic studies of Decapoda. Thus, the aim of this study was to analyze the phylogenetic and biogeographic relationships amongst the species of the genera Hippolyte and Alcyonohippolyte using two mitochondrial and two nuclear markers, based on a broad representation of species. For this study, specimens from 31 of the 32 species currently assigned to the genus Hippolyte, and four of the six species currently in the genus Alcyonohippolyte were available.