A new species of Acitheca (Psaroniaceae, Marattiales) with exceptionally and three-dimensionally preserved sporangia from the Buçaco Carboniferous Basin, western central Portugal Pedro Correia, Sofia Pereira, Zbynĕk Šimůnek, Artur A. Sá, Zélia Pereira Review of Palaeobotany and Palynology, 2025 A new fern fossil-species Acitheca machadoi sp. nov. is erected under the family Psaroniaceae (Marattiales), based on adpression fossil remains of fertile foliage from the Monsarros Formation (upper Stephanian C, upper Gzhelian) of the Buçaco Carboniferous Basin, in western central Portugal. Acitheca machadoi comprises relatively narrow and long fertile pinnules bearing exceptionally and three-dimensionally preserved sporangia with in situ spores. These sporangia are elongate (fusiform) and one of the smallest documented for the genus, with a triangular pyramid-like shape in the upper part and rounded to hexagonal-like attachment base. Its occurrence within an assemblage dominated by mesophytes to hygrophytes, with fewer drought-tolerant forms, suggests a wetland environment with a seasonal climate, framed in the transition from humid to dry conditions in western Iberia during the Late Pennsylvanian–early Permian. This palaeobotanical finding provides new insights on the palaeoecology and species diversity of Acitheca , whose currently known fossil record is certainly underestimated. • A new species of the extinct marattialean fern fossil-genus Acitheca is described from the Upper Pennsylvanian of Portugal. • The new species is erected based on elongate and very small sporangia, comprising one of smallest sporangia known for genus. • Acitheca machadoi sp. nov. shows exceptionally and three-dimensionally preserved sporangia with in situ spores. • New insights on the palaeoecology and species diversity of the genus Acitheca .
The Ordovician‒Silurian boundary beds in the El Pintado section (Sierra Morena de Sevilla Global UNESCO Geopark, SW Spain) Juan Carlos Gutiérrez-Marco, Sara Romero, Sofia Pereira, Petr Štorch Geologica Balcanica, 2024 The El Pintado 1 section of the Ossa-Morena Zone (Valle syncline, SW Spain) includes a rather continuous stratigraphic succession ranging from the Upper Ordovician to the Devonian, including remarkably fossiliferous black graptolitic shales that begin their sedimentation in the basal Silurian Akidograptus ascensus graptolite Biozone. The investigation for the location of the Ordovician–Silurian boundary in previous beds has produced negative results, due to the existence of a probable basal gap equivalent to the lower part of the aforementioned biozone, and the absence of stratigraphically relevant fossils, such as graptolites or conodonts, that could provide a high-resolution biostratigraphy to the Hirnantian succession. Nonetheless, some interesting records of rare shelly fossils in the Valle Shale (Hirnantian) are presented, and the Rhuddanian graptolite biozonation in the lower 38 m of the Lower Graptolite Shale (Rhuddanian to Ludfordian) is discussed.
Late Ordovician cornulitid tubeworms from high-latitude peri-Gondwana (Sardinia and the Pyrenees) and their palaeobiogeographic significance Olev Vinn, Jorge Colmenar, Samuel Zamora, Sofia Pereira, Gian Luigi Pillola, Abdullah A. Alkahtane, Saleh Al Farraj, Magdy El Hedeny Journal of Palaeogeography, 2024 Seven Cornulites species, including a new one — Cornulites leonei n. sp., are described from the Upper Ordovician Portixeddu Formation (Katian, stage slices Ka2–3) of Sardinia and the Cavá (lower Katian, stage slice Ka2) and Estana (upper Katian, stage slices Ka3–4) formations of the Pyrenees. The Sardinian and Pyrenean cornulitids represent an adaptation to live in environments with high sedimentation rates and limited hard substrates availability. Their prominent annuli could have had a stabilizing function in the soft sediment that helped cornulitids to keep a favourable position in the sediment to enable suspension feeding. The known Late Ordovician cornulitid diversity in different Gondwana areas is low, usually ranging from one to three taxa, being higher (seven) in Sardinia. Like other benthic groups during the Late Ordovician, the cornulitid tubeworm faunas within the high-latitude peri-Gondwana Province indicate a certain endemism and share morphological and ecological affinities, such as a small body size and tubes with a strikingly small apical angle. Although essentially endemic, some links with cornulitids from the Late Ordovician of Scotland are revealed. • There was Mediterranena faunal province of cornultids in the Late Ordovician • The cornulitids in the Mediterranean province were usually free growing forms • The cold waters did not support encrustation by cornulitids • The Katian of Sardinia had unusally diverse cornulitid fauna • The cornulitids of the Mediterranean province were less diverse than in Baltica and Laurentia
The trilobite assemblage of the Declivolithus Fauna (lower Katian, Ordovician) of Morocco: A review with new data Sofia Pereira, Isabel Rábano, Juan Carlos Gutiérrez-Marco Journal of Paleontology, 2024 Intense commercial exploitation of fossils in the famous El Qaid Errami area in the last 20 years has led to the discovery of the interesting Declivolithus Fauna in the Moroccan Anti-Atlas. This unusually large trinucleid trilobite, described originally from the Czech Republic, is the most conspicuous element of an assemblage mainly occurring in the Bofloss locality, a local biofacies development of pelagic mudstones and sandstones cropping out in a structurally isolated place in the Tizi n'Ounfite area. Here we revise this Declivolithus Fauna trilobite assemblage from Morocco, increasing the known trilobite diversity from four to 11 species: Ulugtella? biformis n. sp., Selenopeltis cf. S. vultuosa, Phacopidina quadrata, Eudolatites cf. E. bondoni, Prionocheilus cf. P. verneuili, Nobiliasaphus cf. N. kumatox, Cyclopyge cf. C. rediviva, Symphysops stevaninae, Heterocyclopyge sp., Dionide sp., and Declivolithus alfredi. The new data and the very good preservation of specimens in sandstones, clarify the specific identity of previously reported taxa. Although the stratigraphical correlation of the fossiliferous levels remains problematic, it probably corresponds to the upper part of the Lower Ktaoua Formation or to the lower half of the Upper Tiouririne Formation. Most taxa support previous assignment of the Moroccan assemblage to the late Berounian (ca. early Katian, Ka2), although a middle Berounian (ca. Sa2–Ka1) age cannot be excluded. Most of the identified species are known from the Czech Republic (eight out of 11), showing that the strong faunal link between Morocco and the Czech Republic still existed during the Late Ordovician, being stronger than the link with the coeval Ibero-Armorican domain faunas.UUID: http://zoobank.org/3e6e55c7-168d-4008-98ba-38a795581ca3
A new trilobite locality from the Agüeira Formation (Upper Ordovician) of the Vega de Espinareda synclinorium (West Asturian-Leonese Zone, NW Spain) and its stratigraphical interest Sara Romero, Sofia Pereira, Ramiro López Medrano, Francisco Arias Ferrero, Isabel Rábano, Jorge Colmenar, Juan Carlos Gutiérrez-Marco Geogaceta, 2024 Se presenta una nueva localidad paleontológica del Ordovícico del noroeste de España, ubicada en el flanco meridional del sinclinorio de Vega de Espinareda, al norte de Ponferrada (provincia de León). Se trata de la octava localidad con fósiles esqueléticos encontrada en la Formación Agüeira (Ordovícico Superior) del Dominio del Navia-Alto Sil de la Zona Asturoccidental-leonesa, y la primera ubicada en la mitad inferior de la formación. El nuevo yacimiento se sitúa muy próximo a su sección de referencia de la garganta fluvial entre las localidades de Congosto y Santa Marina del Sil, donde estos niveles eran interpretados como facies distales de un abanico submarino, en una sedimentación predominantemente turbidítica. Pero los trilobites, moluscos y braquiópodos encontrados, que por su escasa a nula desarticulación no parecen transportados, revelan una asociación propia de ambientes de plataforma mucho más someros, con fondos oxigenados como revela la alta concentración de galerías horizontales. La presencia de los trilobites Colpocoryphe grandis (Šnajdr) y Dalmanitina n. sp. (D. rabanoae Pereira, n. n.) indica una edad Berouniense temprano (= Sandbiense temprano), lo que abre la posibilidad de que el límite Ordovícico Medio/Superior se sitúe en los 400-450 m basales de la Fm. Agüeira en el sector estudiado.
Panderia beaumonti (Rouault, 1847) of the cabeço do peão formation of middle berounian (upper ordovician, portugal) Comunicacoes Geologicas, 2014
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Discovery of the rare drought-tolerant plant Lesleya (Spermatopsida) from the Buçaco Carboniferous Basin (Stephanian C, western Iberia) and its … L Börjesson, S Pereira, P Correia Historical Biology 37 (10), 2208-2213 , 2025 2025
A new species of Acitheca (Psaroniaceae, Marattiales) with exceptionally and three-dimensionally preserved sporangia from the Buçaco Carboniferous Basin, western central Portugal P Correia, S Pereira, Z Šimůnek, AA Sá, Z Pereira Review of Palaeobotany and Palynology 334, 105274 , 2025 2025 Citations: 1
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Primeiro registo de trilobites no Silúrico de Portugal (Sinclinal de Moncorvo) S Pereira, G Silvério, J Colmenar Lallena, N Moreira, D Silva, A Sá LNEG-Laboratório Nacional de Energia e Geologia , 2025 2025 Citations: 1
Late Ordovician cornulitid tubeworms from high-latitude peri-Gondwana (Sardinia and the Pyrenees) and their palaeobiogeographic significance O Vinn, J Colmenar, S Zamora, S Pereira, GL Pillola, AA Alkahtane, ... Journal of Palaeogeography 13 (4), 939-953 , 2024 2024 Citations: 5
The trilobite assemblage of the Declivolithus Fauna (lower Katian, Ordovician) of Morocco: a review with new data S Pereira, I Rábano, JC Gutiérrez-Marco Journal of Paleontology 98 (4), 686-719 , 2024 2024
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Application of multivariate morphometry to access the morphological variability in sauropod teeth M Ribeiro, PDM Lopes, SP García Zubía, 209-214 , 2024 2024
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Florinanthus bussacensis sp. nov., a new cordaitalean cone from the Upper Pennsylvanian of Portugal P Correia, S Pereira, Z Šimůnek, CJ Cleal Review of Palaeobotany and Palynology 316, 104942 , 2023 2023 Citations: 5
Paleontologia de conodontes em Portugal: estado da arte G Silvério, G Machado, JI Valenzuela-Ríos, N Moreira, S Pereira Universidade de Coimbra , 2023 2023
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Early Ordovician–Devonian passive margin stage in the Gondwanan units of the Iberian Massif JC Gutiérrez-Marco, JM Piçarra, CA Meireles, P Cózar, DC García-Bellido, ... The Geology of Iberia: a Geodynamic Approach: Volume 2: the Variscan Cycle … , 2019 2019 Citations: 66
A Kralodvorian (upper Katian, Upper Ordovician) benthic association from the Ferradosa Formation (Central Portugal) and its significance for the redefinition and subdivision of … AA SÁ, TP YOUNG Bulletin of Geosciences 92 (4), 443-464 , 2017 2017 Citations: 21
Ordovician trilobites from the Tafilalt Lagerstätte: new data and reappraisal of the Bou Nemrou assemblage JC Gutiérrez-Marco, S Pereira, DC García-Bellido, I Rábano 2022 Citations: 20
Trilobites do ordovícico superior da zona centro-ibérica portuguesa SRC Pereira PQDT-Global , 2017 2017 Citations: 17
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The first poroblattinid roachoid from the uppermost Carboniferous of Portugal P Correia, S Pereira, M Cavaleiro, M Correia, AA Sá, A Nel Historical Biology 35 (2), 242-248 , 2023 2023 Citations: 13
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The trilobite Serrodiscus Richter & Richter from Iberia, with systematic review of the genus and its international correlation through the Cambrian Series 2. L Collantes, R Gozalo, E Mayoral, E Liñán, S Pereira Bulletin of Geosciences , 2022 2022 Citations: 11
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The oldest brachymetopid trilobite record from the European peri-Gondwana S Pereira, C SILVA, M Pires, AA Sa Bulletin of Geosciences 90 (3), 543-553 , 2015 2015 Citations: 9
First report of Chelediscus Rushton, 1966 (Trilobita) from Western Gondwana, with description of a new species from the Cambrian Series 2 of Spain L Collantes, S Pereira, E Mayoral, R Gozalo Historical Biology 35 (9), 1701-1708 , 2023 2023 Citations: 8
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Late Ordovician cornulitid tubeworms from high-latitude peri-Gondwana (Sardinia and the Pyrenees) and their palaeobiogeographic significance O Vinn, J Colmenar, S Zamora, S Pereira, GL Pillola, AA Alkahtane, ... Journal of Palaeogeography 13 (4), 939-953 , 2024 2024 Citations: 5
Taxonomy, biostratigraphy and paleobiogeography of Strenuaeva (Trilobita) from the Marianian (Cambrian Series 2) of Iberia L Collantes, S Pereira, E Mayoral, E Linan, A Sepulveda, R Gozalo Geobios 82, 13-30 , 2024 2024 Citations: 5
The Ordovician‒Silurian boundary beds in the El Pintado section (Sierra Morena de Sevilla Global UNESCO Geopark, SW Spain) JC Gutiérrez Marco, S Romero Gómez, S Pereira, P Štorch Bulgarian Academy of Sciences , 2024 2024 Citations: 5