Early Jurassic (Sinemurian) gastropods from the Lusitanian Basin (west of Portugal)
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 Natu...
| Authors: | ; ; |
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| Format: | Article |
| Publication date: | 2020 |
| Country: | España |
| Institution: | Universidad Complutense de Madrid (UCM) |
| Repository: | Docta Complutense |
| Language: | English |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/7109 |
| Online Access: | https://hdl.handle.net/20.500.14352/7109 |
| Access Level: | Open access |
| Keyword: | 564.3“6152”(469) Systematics S. Pedro de Moel Coimbra Obtusum Oxynotum Sistemática Paleontología 2416 Paleontología |
| Summary: | 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. |
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