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Although morphological features of pterosaur dentition have been described in detail in several contributions, the histology of tooth and tooth attachment tissues (i.e. periodontium) has been scarcely analysed to date for this clade. Here we describe and interpret the microstructure of the tooth and periodontium attachment tissues of <jats:italic>Pterodaustro guinazui<\/jats:italic>, a filter\u2010feeding pterodactyloid pterosaur from the Lower Cretaceous of Argentina. The histological analysis of the lower jaw and its filamentous teeth verifies that the geometry of the implantation corresponds to an aulacodont condition (i.e. teeth are set in a groove with no interdental separation). This pattern departs from that recorded in other archosaurs, being possibly also present in other, non\u2010closely related, pterosaurs. Regarding tooth attachment, in contrast to other pterosaurs, there is no direct evidence for gomphosis in <jats:italic>Pterodaustro<\/jats:italic> (i.e. the absence of cementum, mineralized periodontal ligamentum and alveolar bone). Nevertheless, the current evidence for ankylosis is still not conclusive. Contrary to that reported for other archosaurs, replacement teeth are absent in <jats:italic>Pterodaustro<\/jats:italic>, which is interpreted as evidence for monophyodonty or diphyodonty in this taxon. Most of the microstructural features are possibly related to the complex filter\u2010feeding apparatus of <jats:italic>Pterodaustro<\/jats:italic> and does not appear to represent the general pattern of pterosaurs.<\/jats:p>","DOI":"10.1111\/joa.13878","type":"journal-article","created":{"date-parts":[[2023,4,15]],"date-time":"2023-04-15T01:35:51Z","timestamp":1681522551000},"page":"579-589","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Palaeohistology reveals an unusual periodontium and tooth implantation in a filter\u2010feeding pterodactyloid pterosaur, <i>Pterodaustro guinazui<\/i>, from the Lower Cretaceous of Argentina"],"prefix":"10.1111","volume":"243","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6279-0392","authenticated-orcid":false,"given":"Ignacio A.","family":"Cerda","sequence":"first","affiliation":[{"name":"Consejo Nacional de Investigaci\u00f3n Ciencia y T\u00e9cnica (CONICET)  Buenos Aires 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