New Cloudina-like morphotype from the Ediacaran Tamengo Formation (Neoproterozoic, Corumbá Group), Southwest Brazil

The late Ediacaran index fossil Cloudina Germs is known for its funnel-in-funnel tubular calcareous shell. The Brazilian species Cloudina lucianoi (Beurlen and Sommer) occurs in limestones of the Tamengo Formation, near the top of the Corumbá Group, in southwestern Brazil. We report a new Cloudina-l...

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Autores principales:	Meira, F., Pacheco, M. L. A. F., Fairchild, T. R., Boggiani, P. C.
Formato:	Objeto de conferencia Resumen
Lenguaje:	Inglés
Publicado:	2010
Materias:	Ciencias Naturales Paleontología
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/16913
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-16913
record_format	dspace
spelling	I19-R120-10915-169132023-10-24T20:02:09Z http://sedici.unlp.edu.ar/handle/10915/16913 New Cloudina-like morphotype from the Ediacaran Tamengo Formation (Neoproterozoic, Corumbá Group), Southwest Brazil Meira, F. Pacheco, M. L. A. F. Fairchild, T. R. Boggiani, P. C. 2010 2010 2011-04-13T03:00:00Z en Ciencias Naturales Paleontología The late Ediacaran index fossil Cloudina Germs is known for its funnel-in-funnel tubular calcareous shell. The Brazilian species Cloudina lucianoi (Beurlen and Sommer) occurs in limestones of the Tamengo Formation, near the top of the Corumbá Group, in southwestern Brazil. We report a new Cloudina-like morphotype from this formation, based on morphological observations and statistical comparisons of 55 specimens of the new morphotype and 23 of Cloudina from a single rock sample. The new morphotype is more delicate and more completely preserved than shells of C. lucianoi in the same sample. Many of these specimens also bear prominent lateral projections, not previously seen in C. lucianoi, which are interpreted as outward-flaring flanges of distal segments. Statistical analysis of the diameter/ length ratio of the fossils (linear regression and "t" test) revealed significant differences between the two groups, despite the fact that diameters of the new morphotype cluster within the established size limits of C. lucianoi. Hence, the new morphotype may represent a different species and not merely a previously unrecognized ontogenetic stage of C. lucianoi. Statistical analysis further suggests that the shells of C. lucianoi in the sample represent remnants of larger individuals than the new morphotype. Thus, the assemblages in the studied sample bear distinct taphonomic signatures, with the new morphotype representing an in situ biocoenosis, and the C. lucianoi fragments apparently parauthochthonous or allochthonous elements. Sesiones libres Facultad de Ciencias Naturales y Museo Objeto de conferencia Resumen http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Naturales Paleontología
spellingShingle	Ciencias Naturales Paleontología Meira, F. Pacheco, M. L. A. F. Fairchild, T. R. Boggiani, P. C. New Cloudina-like morphotype from the Ediacaran Tamengo Formation (Neoproterozoic, Corumbá Group), Southwest Brazil
topic_facet	Ciencias Naturales Paleontología
description	The late Ediacaran index fossil Cloudina Germs is known for its funnel-in-funnel tubular calcareous shell. The Brazilian species Cloudina lucianoi (Beurlen and Sommer) occurs in limestones of the Tamengo Formation, near the top of the Corumbá Group, in southwestern Brazil. We report a new Cloudina-like morphotype from this formation, based on morphological observations and statistical comparisons of 55 specimens of the new morphotype and 23 of Cloudina from a single rock sample. The new morphotype is more delicate and more completely preserved than shells of C. lucianoi in the same sample. Many of these specimens also bear prominent lateral projections, not previously seen in C. lucianoi, which are interpreted as outward-flaring flanges of distal segments. Statistical analysis of the diameter/ length ratio of the fossils (linear regression and "t" test) revealed significant differences between the two groups, despite the fact that diameters of the new morphotype cluster within the established size limits of C. lucianoi. Hence, the new morphotype may represent a different species and not merely a previously unrecognized ontogenetic stage of C. lucianoi. Statistical analysis further suggests that the shells of C. lucianoi in the sample represent remnants of larger individuals than the new morphotype. Thus, the assemblages in the studied sample bear distinct taphonomic signatures, with the new morphotype representing an in situ biocoenosis, and the C. lucianoi fragments apparently parauthochthonous or allochthonous elements.
format	Objeto de conferencia Resumen
author	Meira, F. Pacheco, M. L. A. F. Fairchild, T. R. Boggiani, P. C.
author_facet	Meira, F. Pacheco, M. L. A. F. Fairchild, T. R. Boggiani, P. C.
author_sort	Meira, F.
title	New Cloudina-like morphotype from the Ediacaran Tamengo Formation (Neoproterozoic, Corumbá Group), Southwest Brazil
title_short	New Cloudina-like morphotype from the Ediacaran Tamengo Formation (Neoproterozoic, Corumbá Group), Southwest Brazil
title_full	New Cloudina-like morphotype from the Ediacaran Tamengo Formation (Neoproterozoic, Corumbá Group), Southwest Brazil
title_fullStr	New Cloudina-like morphotype from the Ediacaran Tamengo Formation (Neoproterozoic, Corumbá Group), Southwest Brazil
title_full_unstemmed	New Cloudina-like morphotype from the Ediacaran Tamengo Formation (Neoproterozoic, Corumbá Group), Southwest Brazil
title_sort	new cloudina-like morphotype from the ediacaran tamengo formation (neoproterozoic, corumbá group), southwest brazil
publishDate	2010
url	http://sedici.unlp.edu.ar/handle/10915/16913
work_keys_str_mv	AT meiraf newcloudinalikemorphotypefromtheediacarantamengoformationneoproterozoiccorumbagroupsouthwestbrazil AT pachecomlaf newcloudinalikemorphotypefromtheediacarantamengoformationneoproterozoiccorumbagroupsouthwestbrazil AT fairchildtr newcloudinalikemorphotypefromtheediacarantamengoformationneoproterozoiccorumbagroupsouthwestbrazil AT boggianipc newcloudinalikemorphotypefromtheediacarantamengoformationneoproterozoiccorumbagroupsouthwestbrazil
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New Cloudina-like morphotype from the Ediacaran Tamengo Formation (Neoproterozoic, Corumbá Group), Southwest Brazil

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