{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,17]],"date-time":"2026-10-17T05:44:54Z","timestamp":1792215894210,"version":"4.4.0"},"reference-count":45,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T00:00:00Z","timestamp":1791417600000},"content-version":"vor","delay-in-days":37,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T00:00:00Z","timestamp":1788220800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["23KJ0818"],"award-info":[{"award-number":["23KJ0818"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["25K24907"],"award-info":[{"award-number":["25K24907"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["26K02079"],"award-info":[{"award-number":["26K02079"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Geobiology"],"published-print":{"date-parts":[[2026,9]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Chitin is a fundamental structural biopolymer, yet its fossil record is predominantly biased towards marine Lagerst\u00e4tten or specific stagnant non\u2010marine settings, leaving its stability in dynamic continental environments poorly understood. Here, we report the molecular preservation of indigenous chitin within the shells of the bivalve\n                    <jats:italic>Nakamuranaia soni<\/jats:italic>\n                    from the Lower Cretaceous Kitadani Formation, Japan\u2014a renowned dinosaur\u2010bearing fluvial succession. While Paleozoic and Jurassic records of chitin exist for arthropods and brackish gastropods, our findings represent one of the earliest direct records of chitinous biopolymers within a strictly freshwater fluvial Lophotrochozoan. High\u2010resolution FE\u2010SEM and histochemical staining (Calcofluor White and Congo Red) revealed exceptionally preserved periostracal honeycomb\u2010like templates, morphologically and chemically congruent with extant unionids. FT\u2010IR spectroscopy confirmed diagnostic polysaccharide backbone linkages and amide modes matching reference\n                    <jats:italic>\u03b2<\/jats:italic>\n                    \u2010chitin, while host\u2010rock analysis (negative control) established the indigenous nature of these organics. Decalcification experiments yielded a rigid silica\u2013chitin hybrid framework, suggesting that early\u2010stage silicification acted as a \u2018taphonomic shield\u2019. We propose that rapid mineralisation, driven by volcaniclastic\u2010rich hydrochemistry, encapsulated the microfibrils, providing both steric hindrance, and chemical stabilisation. This discovery demonstrates that authigenic silicification can mitigate the degradative effects of freshwater diagenesis, significantly expanding the spatial and molecular boundaries of the terrestrial fossil record.\n                  <\/jats:p>","DOI":"10.1111\/gbi.70067","type":"journal-article","created":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T21:03:13Z","timestamp":1791493393000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Exceptional Chitin Preservation Driven by Early\u2010Stage Silicification in Mesozoic Freshwater Environments"],"prefix":"10.1111","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6382-8994","authenticated-orcid":false,"given":"Taro","family":"Yoshimura","sequence":"first","affiliation":[{"name":"The University Museum, the University of Tokyo  Tokyo Japan"},{"name":"Faculty of Science and Technology Keio University  Yokohama City Kanagawa Prefecture Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9437-4251","authenticated-orcid":false,"given":"Kentaro","family":"Nakayama","sequence":"additional","affiliation":[{"name":"Fukui Prefectural Dinosaur Museum  Katsuyama City Fukui Prefecture Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9820-0101","authenticated-orcid":false,"given":"Kaito","family":"Asato","sequence":"additional","affiliation":[{"name":"Fukui Prefectural Dinosaur Museum  Katsuyama City Fukui Prefecture Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5701-5479","authenticated-orcid":false,"given":"Yoshikazu","family":"Noda","sequence":"additional","affiliation":[{"name":"Fukui Prefectural Dinosaur Museum  Katsuyama City Fukui Prefecture Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takenori","family":"Sasaki","sequence":"additional","affiliation":[{"name":"The University Museum, the University of Tokyo  Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,8]]},"reference":[{"key":"e_1_2_10_2_1","volume-title":"Taphonomy: Process and Bias Through Time","author":"Allison P. A.","year":"2010"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41598-022-14469-3"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1163\/1937240X-00002332"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.2110\/palo.2024.025"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.gca.2012.01.018"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.earth.31.100901.144746"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/pala.12219"},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/bies.201400010"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.1093\/icb\/43.1.166"},{"key":"e_1_2_10_11_1","doi-asserted-by":"publisher","DOI":"10.1017\/S1089332600002783"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-90-481-8643-3_11"},{"key":"e_1_2_10_13_1","doi-asserted-by":"publisher","DOI":"10.1130\/G31648.1"},{"key":"e_1_2_10_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0141-8130(02)00039-9"},{"key":"e_1_2_10_15_1","doi-asserted-by":"publisher","DOI":"10.1128\/EC.00079-09"},{"key":"e_1_2_10_16_1","doi-asserted-by":"publisher","DOI":"10.1155\/2008\/670235"},{"key":"e_1_2_10_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.micron.2008.02.004"},{"key":"e_1_2_10_18_1","doi-asserted-by":"publisher","DOI":"10.1038\/srep03497"},{"key":"e_1_2_10_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0146-6380(00)00174-1"},{"key":"e_1_2_10_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/0144-8617(90)90090-F"},{"key":"e_1_2_10_21_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-1-4684-7612-5_10"},{"key":"e_1_2_10_22_1","doi-asserted-by":"publisher","DOI":"10.1098\/rspb.2006.3646"},{"key":"e_1_2_10_23_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.gca.2014.10.018"},{"key":"e_1_2_10_24_1","doi-asserted-by":"publisher","DOI":"10.2517\/prpsj.9.203"},{"key":"e_1_2_10_25_1","doi-asserted-by":"publisher","DOI":"10.3390\/md8051567"},{"key":"e_1_2_10_26_1","doi-asserted-by":"publisher","DOI":"10.2110\/palo.2012.p12-064r"},{"key":"e_1_2_10_27_1","doi-asserted-by":"publisher","DOI":"10.5962\/p.295209"},{"key":"e_1_2_10_28_1","doi-asserted-by":"publisher","DOI":"10.1130\/SPE244"},{"key":"e_1_2_10_29_1","first-page":"583","article-title":"Stratigraphy and Geological Structure of the Tetori Group in the Hakusan District (Part 1. Stratigraphy)","volume":"64","author":"Maeda S.","year":"1958","journal-title":"Journal of the Geological Society of Japan"},{"key":"e_1_2_10_30_1","doi-asserted-by":"publisher","DOI":"10.2741\/s321"},{"key":"e_1_2_10_31_1","doi-asserted-by":"publisher","DOI":"10.1242\/jeb.00709"},{"key":"e_1_2_10_32_1","doi-asserted-by":"publisher","DOI":"10.1016\/0009-2541(94)90059-0"},{"key":"e_1_2_10_33_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2818.2009.03360.x"},{"key":"e_1_2_10_34_1","doi-asserted-by":"publisher","DOI":"10.1080\/08912963.2015.1012509"},{"key":"e_1_2_10_35_1","volume-title":"Chitin","author":"Muzzarelli R. A.","year":"2013"},{"key":"e_1_2_10_36_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1475-4983.2007.00692.x"},{"key":"e_1_2_10_37_1","first-page":"25","article-title":"New View of the Stratigraphy of the Tetori Group in Central Japan","volume":"14","author":"Sano S.","year":"2015","journal-title":"Memoir of the Fukui Prefectural Dinosaur Museum"},{"key":"e_1_2_10_38_1","doi-asserted-by":"publisher","DOI":"10.1038\/416073a"},{"key":"e_1_2_10_39_1","doi-asserted-by":"publisher","DOI":"10.11646\/zootaxa.3914.4.3"},{"key":"e_1_2_10_40_1","doi-asserted-by":"publisher","DOI":"10.1111\/let.12174"},{"key":"e_1_2_10_41_1","doi-asserted-by":"publisher","DOI":"10.1089\/153110702753621312"},{"key":"e_1_2_10_42_1","doi-asserted-by":"publisher","DOI":"10.1666\/13083"},{"key":"e_1_2_10_43_1","first-page":"135","article-title":"Early Cretaceous Freshwater Fishes From the Tetori Group, Central Japan","volume":"3","author":"Yabumoto Y.","year":"2005","journal-title":"Bulletin of the Kitakyushu Museum of Natural History and Human History, Series A (Natural History)"},{"key":"e_1_2_10_44_1","doi-asserted-by":"publisher","DOI":"10.1002\/gj.70254"},{"key":"e_1_2_10_45_1","article-title":"Novel Microscopic Taxonomic Traits Provided by Fossils With Preserved Organic Material: Reclassification in the Cretaceous Bivalve Trigonioidoidea (Palaeoheterodonta)","author":"Yoshimura T.","year":"2026","journal-title":"Journal of Paleontology"},{"key":"e_1_2_10_46_1","article-title":"Exceptional Preservation Reveals the Deep\u2010time Reproductive Ecology and Trophic Breadth of Early Cretaceous Viviparid Gastropods","author":"Yoshimura T.","year":"2026","journal-title":"Communications Biology"}],"container-title":["Geobiology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/gbi.70067","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/full-xml\/10.1111\/gbi.70067","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1111\/gbi.70067","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,10,17]],"date-time":"2026-10-17T05:26:12Z","timestamp":1792214772000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1111\/gbi.70067"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9]]},"references-count":45,"journal-issue":{"issue":"5","published-print":{"date-parts":[[2026,9]]}},"alternative-id":["10.1111\/gbi.70067"],"URL":"https:\/\/doi.org\/10.1111\/gbi.70067","archive":["Portico"],"relation":{},"ISSN":["1472-4677","1472-4669"],"issn-type":[{"value":"1472-4677","type":"print"},{"value":"1472-4669","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9]]},"assertion":[{"value":"2026-06-17","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-09-07","order":2,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2026-10-08","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}],"article-number":"e70067"}}