{"refrec":{"BRefID":287881,"RR":"<b>Schwentner, M.; Bosch, T.C.G.</b> (2015). Revisiting the age, evolutionary history and species level diversity of the genus <i>Hydra</i> (Cnidaria: Hydrozoa). <i>Mol. Phylogenet. Evol. 91</i>: 41-55. <a href=\"https://dx.doi.org/10.1016/j.ympev.2015.05.013\" target=\"_blank\">https://dx.doi.org/10.1016/j.ympev.2015.05.013</a>","BEntID":279906,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Mol. Phylogenet. Evol. 91</i>: 41-55. <a href=\"https://dx.doi.org/10.1016/j.ympev.2015.05.013\" target=\"_blank\">https://dx.doi.org/10.1016/j.ympev.2015.05.013</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Schwentner, M.; Bosch, T.C.G.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Schwentner, M.; Bosch, T.C.G.","Englishabstract":"The genus <i>Hydra</i> has long served as a model system in comparative immunology, developmental and evolutionary biology. Despite its relevance for fundamental research,<i> Hydra’</i>s evolutionary origins and species level diversity are not well understood. Detailed previous studies using molecular techniques identified several clades within <i>Hydra</i>, but how these are related to described species remained largely an open question. In the present study, we compiled all published sequence data for three mitochondrial and nuclear genes (COI, 16S and ITS), complemented these with some new sequence data and delimited main genetic lineages (=hypothetical species) objectively by employing two DNA barcoding approaches. Conclusions on the species status of these main lineages were based on inferences of reproductive isolation. Relevant divergence times within<i> Hydra</i> were estimated based on relaxed molecular clock analyses with four genes (COI, 16S, EF1α and 28S) and four cnidarians fossil calibration points All in all, 28 main lineages could be delimited, many more than anticipated from earlier studies. Because allopatric distributions were common, inferences of reproductive isolation often remained ambiguous but reproductive isolation was rarely refuted. Our results support three major conclusions which are central for <i>Hydra</i> research: (1) species level diversity was underestimated by molecular studies; (2) species affiliations of several crucial ‘workhorses’ of <i>Hydra</i> evolutionary research were wrong and (3) crown group <i>Hydra</i> originated ∼200 mya. Our results demonstrate that the taxonomy of <i>Hydra</i> requires a thorough revision and that evolutionary studies need to take this into account when interspecific comparisons are made. <i>Hydra</i> originated on Pangea. Three of four extant groups evolved ∼70 mya ago, possibly on the northern landmass of Laurasia. Consequently, <i>Hydra</i>’s cosmopolitan distribution is the result of transcontinental and transoceanic dispersal.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Revisiting the age, evolutionary history and species level diversity of the genus <i>Hydra</i> (Cnidaria: Hydrozoa)","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-06 01:33:36.736101","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Divergence times, Evolutionary history, Hydra, Molecular clock, Molecular systematics, Phylogeny","OtherDescriptors":null,"Notes":null,"AnaPub":2015,"MonPub":null,"DateUpdate":"2018-02-13","DateCreate":"2017-08-10","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000358270900005","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.ympev.2015.05.013"},"refs":null,"anarec":{"AnaID":287881,"PubliDate":2015,"Pagination":"41-55","XtraPublOfAnaID":null,"ISBN":null,"Volume":"91","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":45071,"SerRR":"Molecular Phylogenetics and Evolution. 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