![]() This new genus Palaemon, redefined by De Grave & Ashelby, mainly grouped species according to their biogeographical distribution. Two studies suggested to synonymise Palaemonetes, Exopalaemon and Coutierella with Palaemon since their paraphyly was demonstrated. Specifically in Palaemon, extensive worldwide phylogenetic analyses have been performed revealing the need for further systematic rearrangements. Indeed, the family Palaemonidae has been the subject of numerous systematic and evolutionary studies due to its wide geographical distribution, large variety of habitats and the economic importance of some species. Therefore, molecular data could be crucial to elucidate taxonomic ambiguities. Species identification within this group is difficult due to their small size, morphological similarity and expressive plasticity of some characters used in species description, such as the number of teeth of the rostrum, the rostral shape or the position of the branchiostegal tooth. Palaemon currently comprises 88 species, given the recent synonymization of the genera Palaemonetes Heller, 1869, Coutierella Sollaud, 1914 and Exopalaemon Holthuis, 1950 with Palaemon, and five new described species. ![]() The genus Palaemon Weber, 1795 is the third most species-rich genus of the family Palaemonidae Rafinesque, 1815, with marine, estuarine and freshwater shrimps and prawns worldwide distributed in tropical and temperate regions. González-Castellano was supported by a FPU scholarship from Ministerio de Educación, Cultura y Deporte (Spain).Ĭompeting interests: The authors have declared that no competing interests exist. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.ĭata Availability: The datasets generated and/or analyzed during the current study are available in the NCBI repository (accession numbers MT340086-MT340092 and MT340174-MT340196).įunding: This work was funded by a CTM2014-53838-R grant from the Spanish Government (Ministerio de Economía y Competitividad) and by a ED431C 2018/S7 grant from Xunta de Galicia (Programa de Investigación Competitiva do Sistema Universitario Galego, Modalidade de grupos de referencia competitiva: Grupo de Investigación en Biología Evolutiva). Received: Accepted: JPublished: August 18, 2020Ĭopyright: © 2020 González-Castellano et al. PLoS ONE 15(8):Įditor: Gao-Feng Qiu, Shanghai Ocean University, CHINA ![]() Therefore, species crypticism in the genus Palaemon seems to be a common phenomenon.Ĭitation: González-Castellano I, Pons J, González-Ortegón E, Martínez-Lage A (2020) Mitogenome phylogenetics in the genus Palaemon (Crustacea: Decapoda) sheds light on species crypticism in the rockpool shrimp P. ![]() serratus was greater and dated to be much older (4.5-12.3 Ma, Plio-Miocene), so we considered that they could represent two separated species. On the contrary, the divergence between the Atlantic and Mediterranean populations of the common littoral shrimp P. Molecular dating suggested that Pleistocene glaciations were likely involved in the differentiation between the Atlantic and Mediterranean populations of P. Mitochondrial genome and cox1 (1.41%) substitution rate estimates matched those published elsewhere, arguing that the Messinian Salinity Crisis was a plausible event driving the split between P. Our results highlighted the need for future systematics changes in Palaemon and crypticism in P. We provide the largest and the first time-calibrated mitogenome phylogeny of the genus Palaemon and mitogenome substitution rate was estimated (1.59% per million years) in Decapoda for the first time. The Messinian Salinity Crisis (5.3-5.9 Ma, late Miocene) was proposed to be the origin of this cryptic species and it was used as aged constraint for calibration analysis. The mitochondrial protein-coding genes were used, along with those of three other Palaemon species, to perform mitogenome phylogenetic analyses to clarify the evolutionary relationships within the genus, and particularly to shed light on the cryptic species found within P. Here we sequenced and described seven European Palaemon mitochondrial genomes. Species crypticism has been pointed out in several Palaemon species, being the clearest evidence in the European rockpool shrimp P. Palaemon is not currently a monophyletic group, so phylogenetics and systematics are constantly changing. ![]() The genus Palaemon comprises worldwide marine and freshwater shrimps and prawns, and some of them are ecologically or commercially important species. ![]()
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