{"refrec":{"BRefID":438423,"RR":"<b>Flores, J.N.; Martinez, M.I.; Brogger, M.I.</b> (2026). A new genus and species of bathyal cidaroid (Echinoidea: Ctenocidaridae) from the Mar del Plata submarine canyon, Southwest Atlantic, with insights into its phylogenetic affinities. <i>Zool. J. Linn. Soc. 206(3)</i>: zlag044. <a href=\"https://dx.doi.org/10.1093/zoolinnean/zlag044\" target=\"_blank\">https://dx.doi.org/10.1093/zoolinnean/zlag044</a>","BEntID":436255,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Zool. J. Linn. Soc. 206(3)</i>: zlag044. <a href=\"https://dx.doi.org/10.1093/zoolinnean/zlag044\" target=\"_blank\">https://dx.doi.org/10.1093/zoolinnean/zlag044</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Flores, J.N.; Martinez, M.I.; Brogger, M.I.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Flores, J.N.; Martinez, M.I.; Brogger, M.I.","Englishabstract":"The deep ocean represents the largest yet least studied habitat on Earth, and the deep sea off Argentina is no exception. Here, we describe <i>Bathycidaris argentina</i> gen. nov., sp. nov. (Cidaroida: Ctenocidaridae) from the Mar del Plata submarine canyon, Southwest Atlantic, at depths between 1099 and 1950 m. The new taxon is characterized by: a low test, slightly domed aborally; apical disc between 46% and 61% of horizontal test diameter; oblique and non-confluent pore pairs; aboral primary spines rod-like and spinulated; oral primary spines slightly flattened distally, with finely serrated margins; and globiferous pedicellariae, lacking a terminal tooth. Phylogenetic analyses based on mitochondrial cytochrome <i>c</i> oxidase subunit I sequences, using Bayesian inference and maximum likelihood, recover the new taxon as a strongly supported monophyletic lineage within Ctenocidaridae, consistent with intergeneric and species-level genetic divergence. The new species occurs within the core of the Circumpolar Deep Water, suggesting potential connectivity with sub-Antarctic and Antarctic faunas, in addition to possible local isolation associated with canyon topography. This study also highlights unresolved phylogenetic relationships within Ctenocidaridae and underscores the need for a comprehensive systematic reassessment of the family. Overall, our findings contribute to the understanding of deep-sea echinoid diversity and biogeographical patterns in the Southwest Atlantic.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"A new genus and species of bathyal cidaroid (Echinoidea: Ctenocidaridae) from the Mar del Plata submarine canyon, Southwest Atlantic, with insights into its phylogenetic affinities","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-07-14 01:38:04.489036","timezone_type":1,"timezone":"+02:00"},"AuthorKeywords":"echinoderms, echinoids, sea urchins, COI mitochondrial DNA, Bayesian inference, phylogenetic systematics","OtherDescriptors":null,"Notes":null,"AnaPub":2026,"MonPub":null,"DateUpdate":"2026-03-27","DateCreate":"2026-03-27","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0,"DOI":"10.1093/zoolinnean/zlag044"},"refs":null,"anarec":{"AnaID":438423,"PubliDate":2026,"Pagination":"zlag044","XtraPublOfAnaID":null,"ISBN":null,"Volume":"206","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":45039,"SerRR":"Zoological Journal of the Linnean Society. Academic Press: London.  ISSN 0024-4082; e-ISSN 1096-3642","StandardTitleSer":"Zoological Journal of the Linnean Society","ISSN":"0024-4082","AbbrevSer":"Zool. J. Linn. 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