Preliminary study of an astropectinid (Asteroidea, Echinodermata) from the Lower Cretaceous (Mulichinco Formation) of the Neuquén Basin, Argentina

Autores
Fernández, Diana E.; Pérez, Damián; Luci, L.
Año de publicación
2010
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Body fossils of any group of starfish are rarely preserved; mostly they comprise dissociated ossicles only. Astropectinids in particular have a limited fossil record, although they are environmentally broad ranging and numerically important in recent settings. The Mulichinco Formation (Early Valanginian, Mendoza Group) is a clastic, mainly marine and marginal-marine succession, exposed in the Neuquén Province. The sample was recovered from the lowermost levels of this Formation, in the outcrops located along the National Road 40 at the Pampa Tril area (37º15'S, 69º47'W). The sandstone containing the specimen represents the top of one of several coarsening upward successions interpreted as shoreface deposits. The sample is a very well-preserved starfish in oral view. The central area (disk) and the five rays can be identified (two of them are complete, one is almost complete, and two are fractured showing less than a third of their original length). The ambulacral grooves, the inframarginal plates and some of the adambulacral plates corresponding to each of the rays are also observable. The members of the Astropectinidae family exhibit a rather small disc, long and normally straight-sided arms, and contact facets between marginals smaller than the sides of these ossicles. All of these features can be observed in the studied sample. The first records of the Astropectinidae come from Jurassic deposits. The only Mesozoic records of this family come from Europe and North America. This specimen represents, therefore, the first evidence of the existence of this group of starfish in the Cretaceous of South America.
Sesiones libres
Facultad de Ciencias Naturales y Museo
Materia
Ciencias Naturales
Paleontología
Fossils
Starfish
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/16867

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spelling Preliminary study of an astropectinid (Asteroidea, Echinodermata) from the Lower Cretaceous (Mulichinco Formation) of the Neuquén Basin, ArgentinaFernández, Diana E.Pérez, DamiánLuci, L.Ciencias NaturalesPaleontologíaFossilsStarfishBody fossils of any group of starfish are rarely preserved; mostly they comprise dissociated ossicles only. Astropectinids in particular have a limited fossil record, although they are environmentally broad ranging and numerically important in recent settings. The Mulichinco Formation (Early Valanginian, Mendoza Group) is a clastic, mainly marine and marginal-marine succession, exposed in the Neuquén Province. The sample was recovered from the lowermost levels of this Formation, in the outcrops located along the National Road 40 at the Pampa Tril area (37º15'S, 69º47'W). The sandstone containing the specimen represents the top of one of several coarsening upward successions interpreted as shoreface deposits. The sample is a very well-preserved starfish in oral view. The central area (disk) and the five rays can be identified (two of them are complete, one is almost complete, and two are fractured showing less than a third of their original length). The ambulacral grooves, the inframarginal plates and some of the adambulacral plates corresponding to each of the rays are also observable. The members of the Astropectinidae family exhibit a rather small disc, long and normally straight-sided arms, and contact facets between marginals smaller than the sides of these ossicles. All of these features can be observed in the studied sample. The first records of the Astropectinidae come from Jurassic deposits. The only Mesozoic records of this family come from Europe and North America. This specimen represents, therefore, the first evidence of the existence of this group of starfish in the Cretaceous of South America.Sesiones libresFacultad de Ciencias Naturales y Museo2010info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionResumenhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/16867enginfo:eu-repo/semantics/altIdentifier/isbn/978-987-95849-7-2info:eu-repo/semantics/reference/hdl/10915/25738info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T10:53:03Zoai:sedici.unlp.edu.ar:10915/16867Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 10:53:03.319SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Preliminary study of an astropectinid (Asteroidea, Echinodermata) from the Lower Cretaceous (Mulichinco Formation) of the Neuquén Basin, Argentina
title Preliminary study of an astropectinid (Asteroidea, Echinodermata) from the Lower Cretaceous (Mulichinco Formation) of the Neuquén Basin, Argentina
spellingShingle Preliminary study of an astropectinid (Asteroidea, Echinodermata) from the Lower Cretaceous (Mulichinco Formation) of the Neuquén Basin, Argentina
Fernández, Diana E.
Ciencias Naturales
Paleontología
Fossils
Starfish
title_short Preliminary study of an astropectinid (Asteroidea, Echinodermata) from the Lower Cretaceous (Mulichinco Formation) of the Neuquén Basin, Argentina
title_full Preliminary study of an astropectinid (Asteroidea, Echinodermata) from the Lower Cretaceous (Mulichinco Formation) of the Neuquén Basin, Argentina
title_fullStr Preliminary study of an astropectinid (Asteroidea, Echinodermata) from the Lower Cretaceous (Mulichinco Formation) of the Neuquén Basin, Argentina
title_full_unstemmed Preliminary study of an astropectinid (Asteroidea, Echinodermata) from the Lower Cretaceous (Mulichinco Formation) of the Neuquén Basin, Argentina
title_sort Preliminary study of an astropectinid (Asteroidea, Echinodermata) from the Lower Cretaceous (Mulichinco Formation) of the Neuquén Basin, Argentina
dc.creator.none.fl_str_mv Fernández, Diana E.
Pérez, Damián
Luci, L.
author Fernández, Diana E.
author_facet Fernández, Diana E.
Pérez, Damián
Luci, L.
author_role author
author2 Pérez, Damián
Luci, L.
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Naturales
Paleontología
Fossils
Starfish
topic Ciencias Naturales
Paleontología
Fossils
Starfish
dc.description.none.fl_txt_mv Body fossils of any group of starfish are rarely preserved; mostly they comprise dissociated ossicles only. Astropectinids in particular have a limited fossil record, although they are environmentally broad ranging and numerically important in recent settings. The Mulichinco Formation (Early Valanginian, Mendoza Group) is a clastic, mainly marine and marginal-marine succession, exposed in the Neuquén Province. The sample was recovered from the lowermost levels of this Formation, in the outcrops located along the National Road 40 at the Pampa Tril area (37º15'S, 69º47'W). The sandstone containing the specimen represents the top of one of several coarsening upward successions interpreted as shoreface deposits. The sample is a very well-preserved starfish in oral view. The central area (disk) and the five rays can be identified (two of them are complete, one is almost complete, and two are fractured showing less than a third of their original length). The ambulacral grooves, the inframarginal plates and some of the adambulacral plates corresponding to each of the rays are also observable. The members of the Astropectinidae family exhibit a rather small disc, long and normally straight-sided arms, and contact facets between marginals smaller than the sides of these ossicles. All of these features can be observed in the studied sample. The first records of the Astropectinidae come from Jurassic deposits. The only Mesozoic records of this family come from Europe and North America. This specimen represents, therefore, the first evidence of the existence of this group of starfish in the Cretaceous of South America.
Sesiones libres
Facultad de Ciencias Naturales y Museo
description Body fossils of any group of starfish are rarely preserved; mostly they comprise dissociated ossicles only. Astropectinids in particular have a limited fossil record, although they are environmentally broad ranging and numerically important in recent settings. The Mulichinco Formation (Early Valanginian, Mendoza Group) is a clastic, mainly marine and marginal-marine succession, exposed in the Neuquén Province. The sample was recovered from the lowermost levels of this Formation, in the outcrops located along the National Road 40 at the Pampa Tril area (37º15'S, 69º47'W). The sandstone containing the specimen represents the top of one of several coarsening upward successions interpreted as shoreface deposits. The sample is a very well-preserved starfish in oral view. The central area (disk) and the five rays can be identified (two of them are complete, one is almost complete, and two are fractured showing less than a third of their original length). The ambulacral grooves, the inframarginal plates and some of the adambulacral plates corresponding to each of the rays are also observable. The members of the Astropectinidae family exhibit a rather small disc, long and normally straight-sided arms, and contact facets between marginals smaller than the sides of these ossicles. All of these features can be observed in the studied sample. The first records of the Astropectinidae come from Jurassic deposits. The only Mesozoic records of this family come from Europe and North America. This specimen represents, therefore, the first evidence of the existence of this group of starfish in the Cretaceous of South America.
publishDate 2010
dc.date.none.fl_str_mv 2010
dc.type.none.fl_str_mv info:eu-repo/semantics/conferenceObject
info:eu-repo/semantics/publishedVersion
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url http://sedici.unlp.edu.ar/handle/10915/16867
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/isbn/978-987-95849-7-2
info:eu-repo/semantics/reference/hdl/10915/25738
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
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