{"refrec":{"BRefID":332099,"RR":"<b>Paillès, C.; Sylvestre, F.; Tonetto, A.; Mazur, J.-C.; Conrod, S.</b> (2020). New fossil genus and new extant species of diatoms (Stephanodiscaceae, Bacillariophyceae) from Pleistocene sediments in the Neotropics (Guatemala, Central America): adaptation to a changing environment? <i>Eur. J. Taxon. 726(1)</i>: 1-23. <a href=\"https://dx.doi.org/10.5852/ejt.2020.726.1169\" target=\"_blank\">https://dx.doi.org/10.5852/ejt.2020.726.1169</a>","BEntID":325711,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":" <i>Eur. J. Taxon. 726(1)</i>: 1-23. <a href=\"https://dx.doi.org/10.5852/ejt.2020.726.1169\" target=\"_blank\">https://dx.doi.org/10.5852/ejt.2020.726.1169</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Paillès, C.; Sylvestre, F.; Tonetto, A.; Mazur, J.-C.; Conrod, S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Paillès, C. <i>et al.</i>","Englishabstract":"Several taxa of Stephanodiscaceae were found in the upper section of Pleistocene sediments from Lake Petén-Itzá (Guatemala). A new fossil genus <em>Cyclocostis</em> Paillès gen.&nbsp;nov. and new extant species <em>Discostella gabinii</em> Paillès &amp; Sylvestre sp. nov. are described. <em>Cyclocostis</em> gen.&nbsp;nov. is characterized by a strongly tangentially undulated valve surface, coarse unequal striation reaching a central punctum in the valve center, an absence of central lamina and domed criba, widely open alveoli with one median recessed costa bearing marginal fultoportulae and a single rimoportula all within a ring. A single valve face fultoportula is present on the raised part of the valve opposite the rimoportula. Differences relative to similar genera and the delimitation of a new genus are discussed. <em>Discostella gabinii</em> sp.&nbsp;nov. is distinguished by circular and flat valves, a small central area bearing 5 to &gt; 30 scattered large areolae giving a colliculate appearance, medium-sized alveoli, marginal fultoportulae on every 4–5th costa, a single rimoportula and internally smooth valve center. Differences to similar taxa in the genus <em>Discostella</em> are discussed. The succession of the species of <em>Cyclotella</em>, <em>Discostella</em> and <em>Cyclocostis</em> gen.&nbsp;nov. in our record could represent eco-phenotypic responses to particular environmental stress / change.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"New fossil genus and new extant species of diatoms (Stephanodiscaceae, Bacillariophyceae) from Pleistocene sediments in the Neotropics (Guatemala, Central America): adaptation to a changing environment?","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-05-05 01:32:33.198460","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"diatom, Stephanodiscaceae, genus, Cyclocostis rolfii, Discostella gabinii, Pleistocene, Guatemala","OtherDescriptors":null,"Notes":null,"AnaPub":2020,"MonPub":null,"DateUpdate":"2020-12-17","DateCreate":"2020-12-17","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000604626500001","VABBcode":null,"OpenAcc":1,"DOI":"10.5852/ejt.2020.726.1169"},"refs":null,"anarec":{"AnaID":332099,"PubliDate":2020,"Pagination":"1-23","XtraPublOfAnaID":null,"ISBN":null,"Volume":"726","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":215336,"SerRR":"European Journal of Taxonomy. Muséum national d'Histoire naturelle: Paris.  ISSN 2118-9773; e-ISSN 2118-9773","StandardTitleSer":"European Journal of Taxonomy","ISSN":"2118-9773","AbbrevSer":"Eur. J. 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