Research paper
Early Jurassic (Sinemurian) gastropods from the Lusitanian Basin (west of Portugal)
ÍÑIGO VITÓN
Departamento de Geodinámica, Estratigrafía y Paleontología, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, Avenida José Antonio Novais, 12, 28040, Madrid, Spain. iviton@ucm.es
Corresponding author
MARÍA JOSÉ COMAS-RENGIFO
Departamento de Geodinámica, Estratigrafía y Paleontología, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, Avenida José Antonio Novais, 12, 28040, Madrid, Spain. mjcomas@ucm.es
RICARDO PAREDES
Departamento de Geodinámica, Estratigrafía y Paleontología, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, Avenida José Antonio Novais, 12, 28040, Madrid, Spain.
Museu da Ciência da Universidade de Coimbra, Largo Marquês de Pombal, 3000-272, Coimbra & MARE – Marine and Environment Research Centre, Universidade de Coimbra, Portugal. ricardo.paredes@uc.pt
ABSTRACT
The Sinemurian gastropod specimens herein studied come from two sources: from museum collections and from samplings in field. The study of the Sinemurian gastropod specimens housed in the collections of the Museu Geológico (Laboratório Nacional de Energia e Geologia), Museu Nacional de História Natural e da Ciência (University of Lisbon), Museu da Ciência (University of Coimbra) and of the Museu de História Natural e da Ciência (University of Porto), has allowed the systematic and taxonomical update of this material. These specimens come mostly from Sinemurian outcrops in S. Pedro de Moel area and Coimbra region, and were collected by Paul Choffat and collaborators in the geological field works in relation to the cartography of the Portuguese Geological Map in 1887 and 1903. The review of these collections permitted to recognise original material that was used to describe several characteristic species of the Lusitanian Basin, namely Scurriopsis (Scurriopsis) schmidti, Cryptaenia sp., Nerinella ficalhoi, and Boehmiola exilis. The study of the specimens sampled in field has allowed confirming the origin and stratigraphic position of those specimens collected by Choffat. This sampling was carried out in materials of Coimbra and Água de Madeiros formations (Obtusum and Oxynotum chronozones) cropping out in S. Pedro de Moel, Praia Polvoeira, and Praia Pedra do Ouro. A total of 386 specimens have been studied, 266 have been assigned to 14 taxa of 14 families, 13 genera and 8 species. Most of these taxa belong to the subclass Caenogastropoda (61.31% of the specimens), to the order Allogastropoda (30.66%), and the superfamilies Campaniloidea (28.83%) and Nerinoidea (20.8%). The most common species are endemic of the Lusitanian Basin, namely Pseudomelania costae Pictet & Campiche, 1862 and Oonia casta Böhm, 1901. Other species are known in Germany, Luxembourg and Austria basins.
Key words: Systematics, S. Pedro de Moel, Coimbra, Obtusum, Oxynotum.
How to cite: Vitón, Í., Comas-Rengifo, M.J. & Paredes, R. 2020. Early Jurassic (Sinemurian) gastropods from the Lusitanian Basin (west of Portugal). Spanish Journal of Palaeontology, 35 (2), 147-166.
Received 17 December 2019, Accepted 7 March 2020, Published 31 December 2020
https://doi.org/10.7203/sjp.35.2.18478
