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dc.contributor.author
Tortello, Marcelo Franco
dc.contributor.author
Sabattini, Nora Maria
dc.date.available
2020-01-22T19:19:04Z
dc.date.issued
2011-06
dc.identifier.citation
Tortello, Marcelo Franco; Sabattini, Nora Maria; Totoralia, a new conical-shaped mollusk from the middle Cambrian of western Argentina; Universidad de Barcelona; Geologica Acta; 9; 2; 6-2011; 175-185
dc.identifier.issn
1695-6133
dc.identifier.uri
http://hdl.handle.net/11336/95604
dc.description.abstract
The new genus Totoralia from the late middle Cambrian of El Totoral (Mendoza Province, western Argentina) is described herein. It is a delicate, high, bilaterally symmetrical cone with a sub-central apex and five to seven prominent comarginal corrugations. In addition, its surface shows numerous fine comarginal lines, as well as thin, closely spaced radial lirae. Totoralia gen. nov., in most respects, resembles the Cambrian helcionellids Scenella BILLINGS and Palaeacmaea HALL and Whitfield. Although Scenella has been considered as a chondrophorine cnidarian by some authors in the past, now the predominant view is that it is a mollusk. Likewise, several aspects of Totoralia gen. nov. morphology indicate closer affinities with mollusks. The specimens studied constitute elevated cones that are rather consistent in height, implying that they were not flexible structures like those of the chondrophorines. The presence of a short concave slope immediately in front of the apex can also be interpreted as a mollusk feature. In addition, the numerous comarginal lines of the cone are uniform in prominence and constant in spacing, and are only represented on the dorsal surface of the shell; thus, they are most similar to the incremental growth lines of shells of mollusks. The morphology of Totoralia gen. nov. is regarded as primitive in the Helcionelloida because the ancestor of the class is likely to have had a minute, untorted limpet-shaped shell. Although the new genus herein described seems to be endemic to Argentina, the Cambrian occurrences of related scenellid genera suggest affinities with Laurentia.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Universidad de Barcelona
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
HELCIONELLOIDA
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MENDOZA
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MIDDLE CAMBRIAN
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MOLLUSCA
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TOTORALIA
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Paleontología
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Totoralia, a new conical-shaped mollusk from the middle Cambrian of western Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-01-15T20:04:51Z
dc.journal.volume
9
dc.journal.number
2
dc.journal.pagination
175-185
dc.journal.pais
España
dc.journal.ciudad
Barcelona
dc.description.fil
Fil: Tortello, Marcelo Franco. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleozoología Invertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Sabattini, Nora Maria. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleozoología Invertebrados; Argentina
dc.journal.title
Geologica Acta
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000001692
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1344/105.000001692
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