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dc.contributor.author
Hints, Olle
dc.contributor.author
Tonarová, Petra
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Eriksson, Mats E.
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Rubinstein, Claudia V.
dc.contributor.author
de la Puente, Graciela Susana
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dc.date.available
2020-02-03T20:43:22Z
dc.date.issued
2017-07
dc.identifier.citation
Hints, Olle; Tonarová, Petra; Eriksson, Mats E.; Rubinstein, Claudia V.; de la Puente, Graciela Susana; Early Middle Ordovician scolecodonts from north-western Argentina and the emergence of labidognath polychaete jaw apparatuses; Wiley Blackwell Publishing, Inc; Palaeontology; 60; 4; 7-2017; 583-593
dc.identifier.issn
0031-0239
dc.identifier.uri
http://hdl.handle.net/11336/96614
dc.description.abstract
Scolecodonts provide fossil evidence of the evolution and diversification of jaw-bearing polychaetes from the latest Cambrian onwards. However, their record before the Darriwilian (Middle Ordovician) is scarce worldwide, which limits our understanding of key evolutionary events. One such event is the emergence of taxa possessing the asymmetrical labidognath-type jaw apparatus architecture, which became common in the Middle Ordovician and is often dominant throughout the Palaeozoic. Here, we document a small collection of Dapingian scolecodonts from the Capillas section, Sierras Subandinas, north-western Argentina. The isolated elements recovered allowed us to reconstruct the distinctive jaw apparatus, and to introduce a new taxon, Andiprion paxtonae gen. et sp. nov. The maxillary apparatus of Andiprion is intermediate between the symmetrognath type of the Early Ordovician Kadriorgaspis and the labidognath type that is present in polychaetaspids and related taxa. The apparatus architecture of Andiprion corresponds best to the labidognath type, but the morphology of the individual jaws suggests that it may be the most primitive representative of this lineage currently known. We propose that Andiprion-like forms were ancestral to polychaetaspids, polychaeturids and ramphoprionids. The Capillas collection provides supporting evidence for the evolutionary homology of the ‘basal plate’ and the left first maxilla. Thus the labidognath-type asymmetry, with an unpaired left maxilla III, developed as a result of gradual reduction in size of the first right jaw (‘basal plate’) in front of the carriers, instead of loss or fusion of anterior maxillae.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ARGENTINA
dc.subject
EUNICIDA
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EVOLUTION
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ORDOVICIAN
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POLYCHAETE JAW APPARATUS
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SCOLECODONTS
dc.subject.classification
Meteorología y Ciencias Atmosféricas
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Early Middle Ordovician scolecodonts from north-western Argentina and the emergence of labidognath polychaete jaw apparatuses
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-09-12T19:12:23Z
dc.journal.volume
60
dc.journal.number
4
dc.journal.pagination
583-593
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Hints, Olle. Institute Of Geology, Tallinn University Of Technology; Estonia
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Fil: Tonarová, Petra. Czech Geological Survey; República Checa
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Fil: Eriksson, Mats E.. Department Of Geology, Lund University; Suecia
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Fil: Rubinstein, Claudia V.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina
dc.description.fil
Fil: de la Puente, Graciela Susana. Conicet; Argentina
dc.journal.title
Palaeontology
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/pala.12303
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1111/pala.12303
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