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First occurrence of Pterotheca (Gastropoda) from the Silurian (Aeronian) of Spain
Uppsala University, Music and Museums, Museum of Evolution.ORCID iD: 0000-0001-8769-3572
UCM, CSIC, Inst Geociencias, Spain.
2017 (English)In: Geobios, ISSN 0016-6995, E-ISSN 1777-5728, Vol. 50, no 2, 97-104 p.Article in journal (Refereed) Published
Abstract [en]

Pterotheca hispanica nov. sp. is described from the basal beds (Stimulograptus sedgwickii graptolite Zone) of the Formigoso Fm., in the Cantabrian Zone of the Iberian Massif, north-western Spain. This specialized bellerophontoid gastropod is for the first time recorded in the Silurian of peri-Gondwana; it is the only Aeronian species known so far. Its most closely allied relatives are from higher beds placed in the Telychian of Scotland. Pterotheca is considered a highly derived genus within the Pterothecinae of the Carinaropsidae, with the strongly reduced to absent coiling and the growth of the septum being synapomorphies. In the present work it is shown that not only the apical angle of the septum can be used to distinguish species, but also the relative length and width of the septum. In some cases, the slit may extend as far back as the anterior part of the internal septum. Silurian species were hitherto only found in marginal Laurentian and Eastern Avalonian settings. Pterotheca is absent from central Laurentia and Baltica, where it could be expected to be present based on its wide Ordovician distribution. In the light of this, the occurrence of the genus in the Aeronian of Spain seems difficult to explain, albeit the genus was present in peri-Gondwana prior to the end-Ordovician extinction. The extreme scarcity of described taxa recorded from Avalonia, Baltica and Iberia during the Early Silurian may explain this patchy distribution.

Place, publisher, year, edition, pages
2017. Vol. 50, no 2, 97-104 p.
Keyword [en]
Bellerophontoidea, Carinaropsidae, Pterothecinae, Silurian, Palaeobiogeography, Iberian Peninsula
National Category
Biological Systematics
Identifiers
URN: urn:nbn:se:uu:diva-329142DOI: 10.1016/j.geobios.2017.02.003ISI: 000403386300002OAI: oai:DiVA.org:uu-329142DiVA: diva2:1148020
Available from: 2017-10-09 Created: 2017-10-09 Last updated: 2017-10-09Bibliographically approved

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Ebbestad, Jan Ove R.

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