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
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/16867
Ver los metadatos del registro completo
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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 |
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eng |
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eng |
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