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Brachiopod fauna from the peri-Iberian platform system is well-known in the Late Pliensbachian-Toarcian interval. However, the diversity dynamics and the stratigraphical distribution of this group in the Ibero-Levantine Sector of the Iberian Range require more accurate analysis due to the patchy distribution of the outcrops. The abovementioned timespan involved a period of changes in long-term environmental conditions which led to a severe extinction and critical turnovers on the brachiopod fauna (ETMEE). The Ibero-Levantine sector has notable palaeobiogeographical significance as it represents the south-easternmost outcrops of the Iberian Range connecting with the Betic Domain positioned in the South-Iberian Palaeomargin. In this region, the brachiopod fauna has been arranged into six assemblages, showing a discontinuous stratigraphic distribution since its diversity dynamics is markedly conditioned by the extinction phases linked to the ETMEE: Ass. 1, recorded in the Spinatum-lower Tenuicostatum chronozones; Ass. 2, mainly recorded in the Tenuicostatum chronozone; Ass. 3, typifying the lower Serpentinum chronozone; Ass. 4, documented in the Serpentinum-lowermost Bifrons chronozones; Ass. 5, recorded in the Bifrons-Variabilis chronozones, and Ass. 6, distinctive of the Pseudoradiosa-Aalensis chronozones. The faunal succession shows strong affinities with the Euro-Boreal province, what rules out the transitional or even Mediterranean palaeogeographical affinity previously attributed to the southernmost part of this area. Amidst the main brachiopod-based bioevents must be considered the predominance of the genus Lobothyris in the pre-ETMEE assemblages, the conspicuous record of Liospiriferina? undulata, distinctive taxon of the north-African margin and, especially, the first record in the Iberian Peninsula of thecideid marker beds prior to the ETMEE. After the opportunistic strategy conducted by Soaresirhynchia bouchardi the distribution of the post-ETMEE brachiopod assemblages is markedly influenced by the depositional sequences, entailing premature turnovers and involving the earlier record of homeomorphic morphotypes of younger terebratulides and rhynchonellides.Las sucesiones de braquiópodos en el Pliensbachiense superior-Toarciense, ampliamente reconocidas en las plataformas marginales de Iberia, carece de un registro preciso en el sector Ibero-Levantino de la Cordillera Ibérica. Este intervalo engloba un periodo de cambios ambientales significativos, incluyendo un severo evento de extinción y reemplazamiento que condiciona notablemente la distribución de los braquiópodos (ETMEE). El sector Ibero-Levantino posee un especial interés paleobiogeográfico, representando el extremo sudoriental de la Cordillera Ibérica, en contacto con los afloramientos de directriz Bética del paleomargen sud-Ibérico. En esta región, se han definido seis asociaciones que muestran gran similitud con las del resto de áreas epicontinentales de la Cordillera Ibérica, si bien presentan unos bioeventos diferenciadores: As. 1, registrada en la cronozona Spinatum-parte baja de Tenuicostatum; As. 2, fundamentalmente reconocida en la cronozona Tenuicostatum; As. 3, característica de la cronozona Serpentinum (parte basal); As. 4, registrada en las cronozonas Serpentinumparte inferior de Bifrons; As. 5, distintiva de las cronozonas Bifrons-Variabilis y As. 6, típica de las cronozonas Pseudoradiosa-Aalensis. Paleobiogeográficamente, no se registra (pre-ETMEE) ningún taxón distintivo de la provincia Mediterránea, al contrario que en las cuencas béticas contiguas, descartándose el carácter transicional e incluso “bético” que se confería a los afloramientos meridionales de esta región. Entre los bioeventos excepcionales cabe destacar el primer hallazgo de un nivel guía pre-ETMME de Thecideidos, no documentado hasta Benifairóel momento en el resto de plataformas marginales de Iberia. También es diferenciador el bioevento pre-ETMEE de máxima diversidad y abundancia de Liospiriferina? undulata, taxón característico del margen nord-africano, así como una mayor persistencia del género Lobothyris. Tras el ETMEE, se aprecia la estrategia oportunista de Soaresirhynchia bouchardi y una prematura aparición de la As. 5 respecto al resto de la Cordillera Ibérica, confirmando la estrecha relación entre las sucesiones faunísticas y los continuos cambios de facies durante el Toarciense-Aaleniense.This study is a contribution to the project CGL2015-66604-R (MINECO/FEDER) and is also partially supported by the Research Group VIGROB-167 (University of Alicante)

Lower Jurassic brachiopods from the Ibero-Levantine Sector (Iberian Range): Faunal turnovers and critical bioevents