An Early Cretaceous astropectinid (Echinodermata, Asteroidea) from Patagonia (Argentina): A new species and the oldest record of the family for the Southern Hemisphere
Asterozoans are free living, star-shaped echinoderms which are important components of benthic marine faunas worldwide. Their fossil record is, however, poor and fragmentary, probably due to dissarticulation of ossicles. In particular, fossil asteroids are infrequent in South America. A new species...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_07187092_v41_n1_p210_Fernandez |
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todo:paper_07187092_v41_n1_p210_Fernandez2023-10-03T15:36:42Z An Early Cretaceous astropectinid (Echinodermata, Asteroidea) from Patagonia (Argentina): A new species and the oldest record of the family for the Southern Hemisphere Fernández, D.E. Pérez, D.E. Luci, L. Carrizo, M.A. Astropectinidae Early cretaceous Mulichinco formation Neuquén basin Patagonia Tethyaster Cretaceous echinoderm fossil record morphology new species Southern Hemisphere taxonomy Argentina Neuquen Basin Patagonia Asteroidea Asterozoa Astropectinidae Echinodermata Tethyaster Asterozoans are free living, star-shaped echinoderms which are important components of benthic marine faunas worldwide. Their fossil record is, however, poor and fragmentary, probably due to dissarticulation of ossicles. In particular, fossil asteroids are infrequent in South America. A new species of starfish is reported from the early Valanginian of the Mulichinco Formation, Neuquén Basin, in the context of a shallow-water, storm-dominated shoreface environment. The specimen belongs to the Astropectinidae, and was assigned to a new species within the genus Tethyaster Sladen, T. antares sp. nov., characterized by a R:r ratio of 2.43:1, rectangular marginals wider in the interbrachial angles, inferomarginals (28 pairs along a median arc) with slightly convex profile and flat spines (one per ossicle in the interbrachials and two per ossicle in the arms). Both the sedimentologic features of the bearing bed, and the taphonomic signature point to a rapid burial. Considering the presence of well-developed fascioles, it is likely that the specimen was already half buried at the beginning of its taphonomic pathway. This record represents the oldest finding of Astropectinidae in the Southern Hemisphere and the first record of the genus Tethyaster for the Lower Cretaceous of South America. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07187092_v41_n1_p210_Fernandez |
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Universidad de Buenos Aires |
| institution_str |
I-28 |
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R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Astropectinidae Early cretaceous Mulichinco formation Neuquén basin Patagonia Tethyaster Cretaceous echinoderm fossil record morphology new species Southern Hemisphere taxonomy Argentina Neuquen Basin Patagonia Asteroidea Asterozoa Astropectinidae Echinodermata Tethyaster |
| spellingShingle |
Astropectinidae Early cretaceous Mulichinco formation Neuquén basin Patagonia Tethyaster Cretaceous echinoderm fossil record morphology new species Southern Hemisphere taxonomy Argentina Neuquen Basin Patagonia Asteroidea Asterozoa Astropectinidae Echinodermata Tethyaster Fernández, D.E. Pérez, D.E. Luci, L. Carrizo, M.A. An Early Cretaceous astropectinid (Echinodermata, Asteroidea) from Patagonia (Argentina): A new species and the oldest record of the family for the Southern Hemisphere |
| topic_facet |
Astropectinidae Early cretaceous Mulichinco formation Neuquén basin Patagonia Tethyaster Cretaceous echinoderm fossil record morphology new species Southern Hemisphere taxonomy Argentina Neuquen Basin Patagonia Asteroidea Asterozoa Astropectinidae Echinodermata Tethyaster |
| description |
Asterozoans are free living, star-shaped echinoderms which are important components of benthic marine faunas worldwide. Their fossil record is, however, poor and fragmentary, probably due to dissarticulation of ossicles. In particular, fossil asteroids are infrequent in South America. A new species of starfish is reported from the early Valanginian of the Mulichinco Formation, Neuquén Basin, in the context of a shallow-water, storm-dominated shoreface environment. The specimen belongs to the Astropectinidae, and was assigned to a new species within the genus Tethyaster Sladen, T. antares sp. nov., characterized by a R:r ratio of 2.43:1, rectangular marginals wider in the interbrachial angles, inferomarginals (28 pairs along a median arc) with slightly convex profile and flat spines (one per ossicle in the interbrachials and two per ossicle in the arms). Both the sedimentologic features of the bearing bed, and the taphonomic signature point to a rapid burial. Considering the presence of well-developed fascioles, it is likely that the specimen was already half buried at the beginning of its taphonomic pathway. This record represents the oldest finding of Astropectinidae in the Southern Hemisphere and the first record of the genus Tethyaster for the Lower Cretaceous of South America. |
| format |
JOUR |
| author |
Fernández, D.E. Pérez, D.E. Luci, L. Carrizo, M.A. |
| author_facet |
Fernández, D.E. Pérez, D.E. Luci, L. Carrizo, M.A. |
| author_sort |
Fernández, D.E. |
| title |
An Early Cretaceous astropectinid (Echinodermata, Asteroidea) from Patagonia (Argentina): A new species and the oldest record of the family for the Southern Hemisphere |
| title_short |
An Early Cretaceous astropectinid (Echinodermata, Asteroidea) from Patagonia (Argentina): A new species and the oldest record of the family for the Southern Hemisphere |
| title_full |
An Early Cretaceous astropectinid (Echinodermata, Asteroidea) from Patagonia (Argentina): A new species and the oldest record of the family for the Southern Hemisphere |
| title_fullStr |
An Early Cretaceous astropectinid (Echinodermata, Asteroidea) from Patagonia (Argentina): A new species and the oldest record of the family for the Southern Hemisphere |
| title_full_unstemmed |
An Early Cretaceous astropectinid (Echinodermata, Asteroidea) from Patagonia (Argentina): A new species and the oldest record of the family for the Southern Hemisphere |
| title_sort |
early cretaceous astropectinid (echinodermata, asteroidea) from patagonia (argentina): a new species and the oldest record of the family for the southern hemisphere |
| url |
http://hdl.handle.net/20.500.12110/paper_07187092_v41_n1_p210_Fernandez |
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