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Abstract:

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.

Registro:

Documento: Artículo
Título:An Early Cretaceous astropectinid (Echinodermata, Asteroidea) from Patagonia (Argentina): A new species and the oldest record of the family for the Southern Hemisphere
Autor:Fernández, D.E.; Pérez, D.E.; Luci, L.; Carrizo, M.A.
Filiación:Instituto de Estudios Andinos Don Pablo Groeber (IDEAN-CONICET), Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Intendente Güiraldes 2160, Pabellón 2, Ciudad Universitaria, Ciudad Autonoma de Buenos Aires, Argentina
Museo de Ciencias Naturales Bernardino Rivadavia, Ángel Gallardo 470, Ciudad Autónoma de Buenos Aires, Argentina
Palabras clave: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
Año:2014
Volumen:41
Número:1
Página de inicio:210
Página de fin:223
DOI: http://dx.doi.org/10.5027/andgeoV41n1-a08
Título revista:Andean Geology
Título revista abreviado:Andean Geol.
ISSN:07187092
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v41_n1_p210_Fernandez

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Citas:

---------- APA ----------
Fernández, D.E., Pérez, D.E., Luci, L. & Carrizo, M.A. (2014) . An Early Cretaceous astropectinid (Echinodermata, Asteroidea) from Patagonia (Argentina): A new species and the oldest record of the family for the Southern Hemisphere . Andean Geology, 41(1), 210-223.
http://dx.doi.org/10.5027/andgeoV41n1-a08
---------- CHICAGO ----------
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 " . Andean Geology 41, no. 1 (2014) : 210-223.
http://dx.doi.org/10.5027/andgeoV41n1-a08
---------- MLA ----------
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 " . Andean Geology, vol. 41, no. 1, 2014, pp. 210-223.
http://dx.doi.org/10.5027/andgeoV41n1-a08
---------- VANCOUVER ----------
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 . Andean Geol. 2014;41(1):210-223.
http://dx.doi.org/10.5027/andgeoV41n1-a08