We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitlePalaeobiology: Argentinian unhatched pterosaur fossil.AuthorsChiappe LM; Codorniú L; Grellet-Tinner G; Rivarola DPublicationNature, 2004, Vol 432, Issue 7017, p571ISSN1476-4687Publication typearticleDOI10.1038/432571a