Ribeiria pholadiformis Sharpe in Ribeiro (Rostroconchia): history of the study, type-locality and unit, and the topotypical collection of the Geological Museum of Portugal

• Autor(es): Ribeiro, M. ; Nunes, Andreia ; Pereira, Sofia
• Data: 2021
• Identificador Persistente: http://hdl.handle.net/10400.9/3848
• Origem: Repositório do LNEG
• Assunto(s): Middle Ordovician; Darriwilian; Buçaco Syncline; Brejo Fundeiro Formation; Fonte da Horta Formation; Ordovícico Médio; Buçaco Syncline; Brejo Fundeiro Formation; Fonte da Horta Formation
• Tipo de Documento: Artigo científico
• Idioma: Inglês
• Contribuidor(es): Repositório do LNEG

Descrição

ABSTRACT: Ribeiria pholadiformis Sharpe in Ribeiro, the type-species of Ribeirioida (Rostroconcha), was erected almost 170 years ago, based on portuguese fossils from the Middle Ordovician of the Buçaco Syncline. In this paper, we review the history of the study of this species and clarify the type-locality and unit for this taxon: the Cácemes Group (Darriwilian) in the Palheiros stream section (Penacova). The reconstitution of Sharpe’s original label led to discover that one of the paralectotypes is the external mould of the lectotype, being this specimen now divided between the Geological Survey Museum, Keyworth (the latter) and the Natural History Museum, London (the former). Furthermore, we report an unpublished collection of 25 specimens of topotypic material, gathered during the 19th century under the guidance of Nery Delgado, deposited in the Geological Museum of Portugal. Its study will allow assessing the morphological variability of the species for the first time.