{"refrec":{"BRefID":285621,"RR":"<b>David, B.; Saucède, T.; Chenuil, A.; Steimetz, E.; De Ridder, C.</b> (2016). The taxonomic challenge posed by the Antarctic echinoids <i>Abatus bidens</i> and <i>Abatus cavernosus</i> (Schizasteridae, Echinoidea). <i>Polar Biol. 39(5)</i>: 897-912. <a href=\"https://dx.doi.org/10.1007/s00300-015-1842-5\" target=\"_blank\">https://dx.doi.org/10.1007/s00300-015-1842-5</a>","BEntID":277646,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Polar Biol. 39(5)</i>: 897-912. <a href=\"https://dx.doi.org/10.1007/s00300-015-1842-5\" target=\"_blank\">https://dx.doi.org/10.1007/s00300-015-1842-5</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"David, B.; Saucède, T.; Chenuil, A.; Steimetz, E.; De Ridder, C.","OrigTitleTranslFlag":0,"Authorstringtrunc":"David, B. <i>et al.</i>","Englishabstract":"Cryptic species have been repeatedly described for two decades among the Antarctic fauna, challenging the classic model of Antarctic species with circumpolar distributions and leading to revisit the richness of the Antarctic fauna. No cryptic species had been so far recorded among Antarctic echinoids, which are, however, relatively well diversified in the Southern Ocean. The R/V <i>Polarstern</i> cruise PS81 (ANT XXIX/3) came across populations of <i>Abatus bidens</i>, a schizasterid so far known by few specimens that were found living in sympatry with the species <i>Abatus cavernosus</i>. The species <i>A. cavernosus</i> is reported to have a circum-Antarctic distribution, while <i>A. bidens</i> is only recorded with certainty in South Georgia and at the northern tip of the Antarctic Peninsula. Based on genetic and morphological analyses, our results clearly show that <i>A. bidens</i> and <i>A. cavernosus</i> are two distinct species. The analyzed specimens of <i>A. bidens</i> group together in two haplogroups separated from one another by 2.7 % of nucleotide differences. They are located in the Weddell Sea and in the Bransfield Strait. Specimens of <i>A. cavernosus</i> form one single haplogroup separated from haplogroups of <i>A. bidens</i> by 5 and 3.5 % of nucleotide differences, respectively. The species was collected in the Drake Passage and in the Bransfield Strait. Morphological analyses differentiate <i>A. bidens</i> from <i>A. cavernosus.</i> In contrast, the two genetic groups of <i>A.</i><i>bidens</i> cannot be differentiated from one another based on morphology alone, suggesting that they may represent a case of cryptic species, common in many Antarctic taxa, but not yet reported in Antarctic echinoids. This needs to be confirmed by complementary analyses of independent genetic markers.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"The taxonomic challenge posed by the Antarctic echinoids <i>Abatus bidens</i> and <i>Abatus cavernosus</i> (Schizasteridae, Echinoidea)","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-19 01:31:50.374854","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Abatus bidens; Abatus cavernosus; Cryptic species; Echinoidea;Schizasteridae; Southern Ocean","OtherDescriptors":null,"Notes":null,"AnaPub":2016,"MonPub":null,"DateUpdate":"2022-04-25","DateCreate":"2017-05-16","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000374662500010","VABBcode":null,"OpenAcc":0,"DOI":"10.1007/s00300-015-1842-5"},"refs":null,"anarec":{"AnaID":285621,"PubliDate":2016,"Pagination":"897-912","XtraPublOfAnaID":null,"ISBN":null,"Volume":"39","Issue":"5","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43637,"SerRR":"Polar Biology. 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