{"refrec":{"BRefID":353161,"RR":"<b>Mottequin, B.; Goolaerts, S.; Hunt, A.P.; Olive, S.</b> (2021). The erroneous chondrichthyan egg case assignments from the Devonian: implications for the knowledge on the evolution of the reproductive strategy within chondrichthyans. <i>Naturwissenschaften 108(5)</i>: 36. <a href=\"https://dx.doi.org/10.1007/s00114-021-01751-z\" target=\"_blank\">https://dx.doi.org/10.1007/s00114-021-01751-z</a>","BEntID":350870,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Naturwissenschaften 108(5)</i>: 36. <a href=\"https://dx.doi.org/10.1007/s00114-021-01751-z\" target=\"_blank\">https://dx.doi.org/10.1007/s00114-021-01751-z</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Mottequin, B.; Goolaerts, S.; Hunt, A.P.; Olive, S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Mottequin, B. <i>et al.</i>","Englishabstract":"<i>Spiraxis interstrialis</i>, and its junior synonym <i>Fayolia mourloni</i>, an uppermost Famennian (Upper Devonian) fossil first described as algae and subsequently interpreted as the oldest known chondrichthyan egg case, is reinvestigated based on the discovery of several additional specimens in Belgian collections. New data, in particular from micro-CT imaging, allow to refute <i>S. interstrialis</i>, and by extension also <i>Spiraxis major</i> (the type species of <i>Spiraxis</i> Newberry, non Adams) and <i>Spiraxis randalli</i> from the Famennian of New York and Pennsylvania, as chondrichthyan egg cases. Alternative interpretations of these enigmatic helicoidal fossils are discussed. The first occurrence of oviparity in the fossil record of chondrichthyans is thus not as old as previously thought and is close to the first occurrence of viviparity in this group, both being recognised now in the Mississippian. The question of which of both conditions is plesiomorphic within chondrichthyans, and more widely within vertebrates, is discussed. Also, the presence of the genus <i>Spiraxis</i> in both the USA (east coast) and Belgium reinforces the strong faunal resemblance already observed in both palaeogeographical areas. It suggests important faunal exchanges between these regions of the Euramerica landmass during the Famennian.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"The erroneous chondrichthyan egg case assignments from the Devonian: implications for the knowledge on the evolution of the reproductive strategy within chondrichthyans","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Fish egg cases; Bioturbations; Coprolites; Micro-CT imaging; Chondrichthyans; Reproductive strategy","OtherDescriptors":null,"Notes":null,"AnaPub":2021,"MonPub":null,"DateUpdate":"2022-06-29","DateCreate":"2022-06-28","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000688456200001","VABBcode":null,"OpenAcc":0,"DOI":"10.1007/s00114-021-01751-z"},"refs":null,"anarec":{"AnaID":353161,"PubliDate":2021,"Pagination":"36","XtraPublOfAnaID":null,"ISBN":null,"Volume":"108","Issue":"5","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43434,"SerRR":"Naturwissenschaften. 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