Taxonomic analysis of the first ophiuroid remains for the Mesozoic of South America: the youngest record of the extinct genus Ophiopetra Hess
- Autores
- Pazos, Pablo Jose; Giachetti, Luciana María; Fernández, Diana Elizabeth; Stöhr, Sabine; Thuy, Ben; Perez, Damián; Comerio, Marcos
- Año de publicación
- 2018
- Idioma
- inglés
- Tipo de recurso
- documento de conferencia
- Estado
- versión publicada
- Descripción
- The findings of articulated and/or nearly complete brittle stars in South America are restricted to Devonian, Permian and Cenozoic specimens. In this work ophiuroids are described from the Neuquén Basin, Patagonia, Argentina. These are the first remains of ophiuroids for the Mesozoic of South America. The specimens show a circular disc approximately 3.5 mm in diameter, and five long and slender arms that are 3 times longer than the disc diameter. Lateral arm plates are stout, subquadrangular to subrectangular with distal edge convex and proximal and lateral edges mostly straight. The height/length ratio is approximately 0.62 in proximal lateral arm plates and 0.30 in the distal ones. There are one or two horseshoe-shaped arm spine articulations per lateral arm plate. Dorsal arm plates are subtriangular with convex distal edge, acute proximal edge and straight to slightly convex lateral edges. Ventral arm plates are subrectangular with concave lateral edges, acute proximal edge and pointed to slightly convex distal edge. The lateral arm plates exhibited by the specimens described herein are similar to what is found in Ophiodoris Koehler and Ophioplax Lyman. However, the disc ornamentation differs from both taxa: both sides of the disc are densely covered with granules. We therefore place these specimens in the extinct genus Ophiopetra Hess, also taking into account similarities in the overall shape of the lateral arm plates. The specimens belong to a new species but are poorly preserved. A new name is not introduced, as it would be based on an incomplete diagnosis. The systematic position of Ophiopetra has been under debate, ever since the erection of the genus. At the moment, Ophiopetra is considered an ophiolepidid. In the context of the latest progress in ophiuroid systematics, and thanks to new insights on the spine articulation microstructure of Ophiopetra lithographica presented herein, a transfer of Ophiopetra to the family Ophionereididae within the order Amphilepidida is proposed. This material expands the palaeogeographic record of this genus, since it represents the first remains of Ophiopetra described from the Southern Hemisphere. It is also the first post-Jurassic record of the genus worldwide.
Fil: Pazos, Pablo Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Giachetti, Luciana María. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Fernández, Diana Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Stöhr, Sabine. Swedish Museum of Natural History; Suecia
Fil: Thuy, Ben. Natural History Museum Luxembourg; Luxemburgo
Fil: Perez, Damián. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Comerio, Marcos. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; Argentina
5th International Paleontological Congress
París
Francia
International Paleontological Association - Materia
-
Ophiopetra
Cretaceous
South America
Ophiuroidea - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
.jpg)
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/263823
Ver los metadatos del registro completo
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Taxonomic analysis of the first ophiuroid remains for the Mesozoic of South America: the youngest record of the extinct genus Ophiopetra HessPazos, Pablo JoseGiachetti, Luciana MaríaFernández, Diana ElizabethStöhr, SabineThuy, BenPerez, DamiánComerio, MarcosOphiopetraCretaceousSouth AmericaOphiuroideahttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The findings of articulated and/or nearly complete brittle stars in South America are restricted to Devonian, Permian and Cenozoic specimens. In this work ophiuroids are described from the Neuquén Basin, Patagonia, Argentina. These are the first remains of ophiuroids for the Mesozoic of South America. The specimens show a circular disc approximately 3.5 mm in diameter, and five long and slender arms that are 3 times longer than the disc diameter. Lateral arm plates are stout, subquadrangular to subrectangular with distal edge convex and proximal and lateral edges mostly straight. The height/length ratio is approximately 0.62 in proximal lateral arm plates and 0.30 in the distal ones. There are one or two horseshoe-shaped arm spine articulations per lateral arm plate. Dorsal arm plates are subtriangular with convex distal edge, acute proximal edge and straight to slightly convex lateral edges. Ventral arm plates are subrectangular with concave lateral edges, acute proximal edge and pointed to slightly convex distal edge. The lateral arm plates exhibited by the specimens described herein are similar to what is found in Ophiodoris Koehler and Ophioplax Lyman. However, the disc ornamentation differs from both taxa: both sides of the disc are densely covered with granules. We therefore place these specimens in the extinct genus Ophiopetra Hess, also taking into account similarities in the overall shape of the lateral arm plates. The specimens belong to a new species but are poorly preserved. A new name is not introduced, as it would be based on an incomplete diagnosis. The systematic position of Ophiopetra has been under debate, ever since the erection of the genus. At the moment, Ophiopetra is considered an ophiolepidid. In the context of the latest progress in ophiuroid systematics, and thanks to new insights on the spine articulation microstructure of Ophiopetra lithographica presented herein, a transfer of Ophiopetra to the family Ophionereididae within the order Amphilepidida is proposed. This material expands the palaeogeographic record of this genus, since it represents the first remains of Ophiopetra described from the Southern Hemisphere. It is also the first post-Jurassic record of the genus worldwide.Fil: Pazos, Pablo Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Giachetti, Luciana María. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Fernández, Diana Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Stöhr, Sabine. Swedish Museum of Natural History; SueciaFil: Thuy, Ben. Natural History Museum Luxembourg; LuxemburgoFil: Perez, Damián. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Comerio, Marcos. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; Argentina5th International Paleontological CongressParísFranciaInternational Paleontological AssociationInternational Palaeontological Association2018info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectCongresoBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/263823Taxonomic analysis of the first ophiuroid remains for the Mesozoic of South America: the youngest record of the extinct genus Ophiopetra Hess; 5th International Paleontological Congress; París; Francia; 2018; 1061-1061CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://ipc5.sciencesconf.org/data/IPC5_Abstract_Book.pdfInternacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-17T11:23:39Zoai:ri.conicet.gov.ar:11336/263823instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-17 11:23:39.89CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
| dc.title.none.fl_str_mv |
Taxonomic analysis of the first ophiuroid remains for the Mesozoic of South America: the youngest record of the extinct genus Ophiopetra Hess |
| title |
Taxonomic analysis of the first ophiuroid remains for the Mesozoic of South America: the youngest record of the extinct genus Ophiopetra Hess |
| spellingShingle |
Taxonomic analysis of the first ophiuroid remains for the Mesozoic of South America: the youngest record of the extinct genus Ophiopetra Hess Pazos, Pablo Jose Ophiopetra Cretaceous South America Ophiuroidea |
| title_short |
Taxonomic analysis of the first ophiuroid remains for the Mesozoic of South America: the youngest record of the extinct genus Ophiopetra Hess |
| title_full |
Taxonomic analysis of the first ophiuroid remains for the Mesozoic of South America: the youngest record of the extinct genus Ophiopetra Hess |
| title_fullStr |
Taxonomic analysis of the first ophiuroid remains for the Mesozoic of South America: the youngest record of the extinct genus Ophiopetra Hess |
| title_full_unstemmed |
Taxonomic analysis of the first ophiuroid remains for the Mesozoic of South America: the youngest record of the extinct genus Ophiopetra Hess |
| title_sort |
Taxonomic analysis of the first ophiuroid remains for the Mesozoic of South America: the youngest record of the extinct genus Ophiopetra Hess |
| dc.creator.none.fl_str_mv |
Pazos, Pablo Jose Giachetti, Luciana María Fernández, Diana Elizabeth Stöhr, Sabine Thuy, Ben Perez, Damián Comerio, Marcos |
| author |
Pazos, Pablo Jose |
| author_facet |
Pazos, Pablo Jose Giachetti, Luciana María Fernández, Diana Elizabeth Stöhr, Sabine Thuy, Ben Perez, Damián Comerio, Marcos |
| author_role |
author |
| author2 |
Giachetti, Luciana María Fernández, Diana Elizabeth Stöhr, Sabine Thuy, Ben Perez, Damián Comerio, Marcos |
| author2_role |
author author author author author author |
| dc.subject.none.fl_str_mv |
Ophiopetra Cretaceous South America Ophiuroidea |
| topic |
Ophiopetra Cretaceous South America Ophiuroidea |
| purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
| dc.description.none.fl_txt_mv |
The findings of articulated and/or nearly complete brittle stars in South America are restricted to Devonian, Permian and Cenozoic specimens. In this work ophiuroids are described from the Neuquén Basin, Patagonia, Argentina. These are the first remains of ophiuroids for the Mesozoic of South America. The specimens show a circular disc approximately 3.5 mm in diameter, and five long and slender arms that are 3 times longer than the disc diameter. Lateral arm plates are stout, subquadrangular to subrectangular with distal edge convex and proximal and lateral edges mostly straight. The height/length ratio is approximately 0.62 in proximal lateral arm plates and 0.30 in the distal ones. There are one or two horseshoe-shaped arm spine articulations per lateral arm plate. Dorsal arm plates are subtriangular with convex distal edge, acute proximal edge and straight to slightly convex lateral edges. Ventral arm plates are subrectangular with concave lateral edges, acute proximal edge and pointed to slightly convex distal edge. The lateral arm plates exhibited by the specimens described herein are similar to what is found in Ophiodoris Koehler and Ophioplax Lyman. However, the disc ornamentation differs from both taxa: both sides of the disc are densely covered with granules. We therefore place these specimens in the extinct genus Ophiopetra Hess, also taking into account similarities in the overall shape of the lateral arm plates. The specimens belong to a new species but are poorly preserved. A new name is not introduced, as it would be based on an incomplete diagnosis. The systematic position of Ophiopetra has been under debate, ever since the erection of the genus. At the moment, Ophiopetra is considered an ophiolepidid. In the context of the latest progress in ophiuroid systematics, and thanks to new insights on the spine articulation microstructure of Ophiopetra lithographica presented herein, a transfer of Ophiopetra to the family Ophionereididae within the order Amphilepidida is proposed. This material expands the palaeogeographic record of this genus, since it represents the first remains of Ophiopetra described from the Southern Hemisphere. It is also the first post-Jurassic record of the genus worldwide. Fil: Pazos, Pablo Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina Fil: Giachetti, Luciana María. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Fernández, Diana Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina Fil: Stöhr, Sabine. Swedish Museum of Natural History; Suecia Fil: Thuy, Ben. Natural History Museum Luxembourg; Luxemburgo Fil: Perez, Damián. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Comerio, Marcos. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; Argentina 5th International Paleontological Congress París Francia International Paleontological Association |
| description |
The findings of articulated and/or nearly complete brittle stars in South America are restricted to Devonian, Permian and Cenozoic specimens. In this work ophiuroids are described from the Neuquén Basin, Patagonia, Argentina. These are the first remains of ophiuroids for the Mesozoic of South America. The specimens show a circular disc approximately 3.5 mm in diameter, and five long and slender arms that are 3 times longer than the disc diameter. Lateral arm plates are stout, subquadrangular to subrectangular with distal edge convex and proximal and lateral edges mostly straight. The height/length ratio is approximately 0.62 in proximal lateral arm plates and 0.30 in the distal ones. There are one or two horseshoe-shaped arm spine articulations per lateral arm plate. Dorsal arm plates are subtriangular with convex distal edge, acute proximal edge and straight to slightly convex lateral edges. Ventral arm plates are subrectangular with concave lateral edges, acute proximal edge and pointed to slightly convex distal edge. The lateral arm plates exhibited by the specimens described herein are similar to what is found in Ophiodoris Koehler and Ophioplax Lyman. However, the disc ornamentation differs from both taxa: both sides of the disc are densely covered with granules. We therefore place these specimens in the extinct genus Ophiopetra Hess, also taking into account similarities in the overall shape of the lateral arm plates. The specimens belong to a new species but are poorly preserved. A new name is not introduced, as it would be based on an incomplete diagnosis. The systematic position of Ophiopetra has been under debate, ever since the erection of the genus. At the moment, Ophiopetra is considered an ophiolepidid. In the context of the latest progress in ophiuroid systematics, and thanks to new insights on the spine articulation microstructure of Ophiopetra lithographica presented herein, a transfer of Ophiopetra to the family Ophionereididae within the order Amphilepidida is proposed. This material expands the palaeogeographic record of this genus, since it represents the first remains of Ophiopetra described from the Southern Hemisphere. It is also the first post-Jurassic record of the genus worldwide. |
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Taxonomic analysis of the first ophiuroid remains for the Mesozoic of South America: the youngest record of the extinct genus Ophiopetra Hess; 5th International Paleontological Congress; París; Francia; 2018; 1061-1061 CONICET Digital CONICET |
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