Affiliation:
1. Department of Invertebrate Zoology, Smithsonian Institution, National Museum of Natural History, Washington, DC, USA
2. Department of Biological Sciences, University of Delaware, Newark, DE, USA
3. National Systematics Laboratory of NOAA’s Fisheries Service, Smithsonian Institution, Washington, DC, USA
4. College of Earth, Ocean and Environment, University of Delaware, Lewes, DE, USA
Abstract
BackgroundSpecies of the scyphozoan family Pelagiidae (e.g.,Pelagia noctiluca,Chrysaora quinquecirrha) are well-known for impacting fisheries, aquaculture, and tourism, especially for the painful sting they can inflict on swimmers. However, historical taxonomic uncertainty at the genus (e.g., new genusMawia) and species levels hinders progress in studying their biology and evolutionary adaptations that make them nuisance species, as well as ability to understand and/or mitigate their ecological and economic impacts.MethodsWe collected nuclear (28SrDNA) and mitochondrial (cytochromecoxidase I and16SrDNA) sequence data from individuals of all four pelagiid genera, including 11 of 13 currently recognized species ofChrysaora. To examine species boundaries in the U.S. Atlantic sea nettleChrysaora quinquecirrha, specimens were included from its entire range along the U.S. Atlantic and Gulf of Mexico coasts, with representatives also examined morphologically (macromorphology and cnidome).ResultsPhylogenetic analyses show that the genusChrysaorais paraphyletic with respect to other pelagiid genera. In combined analyses,Mawia, sampled from the coast of Senegal, is most closely related toSanderia malayensis, andPelagiaforms a close relationship to a clade of PacificChrysaoraspecies (Chrysaora achlyos, Chrysaora colorata,Chrysaora fuscescens, andChrysaora melanaster).Chrysaora quinquecirrhais polyphyletic, with one clade from the U.S. coastal Atlantic and another in U.S. Atlantic estuaries and Gulf of Mexico. These genetic differences are reflected in morphology, e.g., tentacle and lappet number, oral arm length, and nematocyst dimensions. Caribbean sea nettles (Jamaica and Panama) are genetically similar to the U.S. Atlantic estuaries and Gulf of Mexico clade ofChrysaora quinquecirrha.DiscussionOur phylogenetic hypothesis for Pelagiidae contradicts current generic definitions, revealing major disagreements between DNA-based and morphology-based phylogenies. A paraphyleticChrysaoraraises systematic questions at the genus level for Pelagiidae; accepting the validity of the recently erected genusMawia, as well as past genera, will require the creation of additional pelagiid genera. Historical review of the species-delineating genetic and morphological differences indicates thatChrysaora quinquecirrhaDesor 1848 applies to the U.S. Coastal AtlanticChrysaoraspecies (U.S. Atlantic sea nettle), while the nameC. chesapeakeiPapenfuss 1936 applies to the U.S. Atlantic estuarine and Gulf of Mexico Chrysaora species (Atlantic bay nettle). We provide a detailed redescription, with designation of a neotype forChrysaora chesapeakei, and clarify the description ofChrysaora quinquecirrha. Since CaribbeanChrysaoraare genetically similar toChrysaora chesapeakei, we provisionally term themChrysaorac.f.chesapeakei. The presence ofMawia benovicioff the coast of Western Africa provides a potential source region for jellyfish introduced into the Adriatic Sea in 2013.
Funder
Lerner-Gray Grant for Marine Research (American Museum of Natural History)
Subject
General Agricultural and Biological Sciences,General Biochemistry, Genetics and Molecular Biology,General Medicine,General Neuroscience
Reference169 articles.
1. North American Acelephae;Agassiz;Illustrated Catalogue of the Museum of Comparative Zoology at Harvard College,1865
2. On Dactylometra;Agassiz;Bulletin of the Museum of Comparative Zoology at Harvard College,1898
3. Gapped BLAST and PSI-BLAST: a new generation of protein database search programs;Altschul;Nucleic Acids Research,1997
4. A gastropod from the tropical Atlantic becomes an established alien in the Mediterranean;Antit;Biological Invasions,2010
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