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We review and discuss data from 214 samples from six Lower Jurassic successions (upper Sinemurian to upper Toarcian) in the Lusitanian Basin. The late Pliensbachian radiation of dinoflagellate cysts was well recognized in this basin. The pre-Jenkyns Event interval is highly productive, with maximum abundance and species richness values. However, this palaeoenvironmental perturbation severely affected the evolution of this group for the remainder of the Early Jurassic. The prolonged recovery of the dinoflagellates in the Toarcian following the Jenkyns Event is not typical of the northern regions (Arctic and Boreal realms), where new species began to evolve earlier compared with southern European basins.<\/jats:p>","DOI":"10.1144\/sp514-2020-255","type":"journal-article","created":{"date-parts":[[2021,3,19]],"date-time":"2021-03-19T15:20:13Z","timestamp":1616167213000},"page":"13-30","update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":10,"title":["The effects of the Jenkyns Event on the radiation of Early Jurassic dinoflagellate cysts"],"prefix":"10.1144","volume":"514","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5648-3185","authenticated-orcid":false,"given":"V\u00e2nia F.","family":"Correia","sequence":"first","affiliation":[{"name":"Centro de Investiga\u00e7\u00e3o Marinha e Ambiental, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal"},{"name":"LNEG, Rua da Amieira, 4465-965 S. Mamede de Infesta, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5529-8989","authenticated-orcid":false,"given":"James B.","family":"Riding","sequence":"additional","affiliation":[{"name":"British Geological Survey, Keyworth, Nottingham NG12 5GG, UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9025-5896","authenticated-orcid":false,"given":"Lu\u00eds V.","family":"Duarte","sequence":"additional","affiliation":[{"name":"University of Coimbra, MARE \u2013 Marine and Environmental Sciences Centre and Department of Earth Sciences, Rua S\u00edlvio Lima, 3030-790 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4888-0230","authenticated-orcid":false,"given":"Paulo","family":"Fernandes","sequence":"additional","affiliation":[{"name":"Centro de Investiga\u00e7\u00e3o Marinha e Ambiental, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3056-6219","authenticated-orcid":false,"given":"Z\u00e9lia","family":"Pereira","sequence":"additional","affiliation":[{"name":"LNEG, Rua da Amieira, 4465-965 S. 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