Totoralia, a new conical-shaped mollusk from the middle Cambrian of western Argentina

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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 fin...

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Detalles Bibliográficos
Autores principales: Tortello, Marcelo Franco, Sabattini, Nora
Formato: Articulo
Lenguaje:Inglés
Publicado: 2011
Materias:
Paleontología
Zoología
Mollusca
Helcionelloida
Totoralia
Middle Cambrian
Mendoza
Argentina
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/114701
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-114701
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Paleontología
Zoología
Mollusca
Helcionelloida
Totoralia
Middle Cambrian
Mendoza
Argentina
spellingShingle Paleontología
Zoología
Mollusca
Helcionelloida
Totoralia
Middle Cambrian
Mendoza
Argentina
Tortello, Marcelo Franco
Sabattini, Nora
Totoralia, a new conical-shaped mollusk from the middle Cambrian of western Argentina
topic_facet Paleontología
Zoología
Mollusca
Helcionelloida
Totoralia
Middle Cambrian
Mendoza
Argentina
description 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.
format Articulo
Articulo
author Tortello, Marcelo Franco
Sabattini, Nora
author_facet Tortello, Marcelo Franco
Sabattini, Nora
author_sort Tortello, Marcelo Franco
title Totoralia, a new conical-shaped mollusk from the middle Cambrian of western Argentina
title_short Totoralia, a new conical-shaped mollusk from the middle Cambrian of western Argentina
title_full Totoralia, a new conical-shaped mollusk from the middle Cambrian of western Argentina
title_fullStr Totoralia, a new conical-shaped mollusk from the middle Cambrian of western Argentina
title_full_unstemmed Totoralia, a new conical-shaped mollusk from the middle Cambrian of western Argentina
title_sort totoralia, a new conical-shaped mollusk from the middle cambrian of western argentina
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/114701
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AT sabattininora totoraliaanewconicalshapedmolluskfromthemiddlecambrianofwesternargentina
bdutipo_str Repositorios
_version_ 1764820446573756418

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