INVESTIGADORES
CASADIO Silvio Alberto
artículos
Título:
Maastrichtian-Danian echinoids from northern Patagonia, Argentina
Autor/es:
PARMA, GRACIELA; CASADIO, SILVIO
Revista:
JOURNAL OF PALEONTOLOGY
Editorial:
Allen Press
Referencias:
Lugar: Lawrence; Año: 2005 vol. 79 p. 1072 - 1087
ISSN:
0022-3360
Resumen:
Echinoids are among the most conspicuous and diverse constituents of the Upper Cretaceous and Paleocene marine
invertebrate fauna of Argentina. Nine species were collected from localities exposing the Jagu¨el (Maastrichtian), Roca (Maastrichtian
Danian), Salamanca (Danian), Arroyo Barbudo (Danian), El Fuerte (Danian), and Arroyo Salado (Danian) Formations in northern
Patagonia, Argentina. Only one of these taxa, Paraster joannisboehmi (Oppenheim in Bo¨hm, 1903), has been described previously
from Argentina. Four taxa, Gauthieria menuthiae (Lambert and Savin in Lambert and Thie´ry, 1911), Nucleopygus pullatus (Stoliczka,
1873), Diplodetus nutrix (Lambert in Boule, 1899), and Hemiaster hawkinsi Lambert, 1933, have been described previously from
Madagascar. One species, Micropsis desori (Cotteau in Leymerie and Cotteau, 1856), has been described previously from France. One
taxon, Pygopistes parrasae is a new species. Argentinian cassiduloids include the only two known Danian species of Nucleopygus andParaster joannisboehmi (Oppenheim in Bo¨hm, 1903), has been described previously
from Argentina. Four taxa, Gauthieria menuthiae (Lambert and Savin in Lambert and Thie´ry, 1911), Nucleopygus pullatus (Stoliczka,
1873), Diplodetus nutrix (Lambert in Boule, 1899), and Hemiaster hawkinsi Lambert, 1933, have been described previously from
Madagascar. One species, Micropsis desori (Cotteau in Leymerie and Cotteau, 1856), has been described previously from France. One
taxon, Pygopistes parrasae is a new species. Argentinian cassiduloids include the only two known Danian species of Nucleopygus andGauthieria menuthiae (Lambert and Savin in Lambert and Thie´ry, 1911), Nucleopygus pullatus (Stoliczka,
1873), Diplodetus nutrix (Lambert in Boule, 1899), and Hemiaster hawkinsi Lambert, 1933, have been described previously from
Madagascar. One species, Micropsis desori (Cotteau in Leymerie and Cotteau, 1856), has been described previously from France. One
taxon, Pygopistes parrasae is a new species. Argentinian cassiduloids include the only two known Danian species of Nucleopygus andDiplodetus nutrix (Lambert in Boule, 1899), and Hemiaster hawkinsi Lambert, 1933, have been described previously from
Madagascar. One species, Micropsis desori (Cotteau in Leymerie and Cotteau, 1856), has been described previously from France. One
taxon, Pygopistes parrasae is a new species. Argentinian cassiduloids include the only two known Danian species of Nucleopygus andMicropsis desori (Cotteau in Leymerie and Cotteau, 1856), has been described previously from France. One
taxon, Pygopistes parrasae is a new species. Argentinian cassiduloids include the only two known Danian species of Nucleopygus andPygopistes parrasae is a new species. Argentinian cassiduloids include the only two known Danian species of Nucleopygus and
Pygopistes. The spatangoids were not strongly affected by the K-T extinction event. Comparisons of the Patagonian echinoids with
those of the Northern Hemisphere indicate that they were strongly influenced by dispersal from Tethyan sources.. The spatangoids were not strongly affected by the K-T extinction event. Comparisons of the Patagonian echinoids with
those of the Northern Hemisphere indicate that they were strongly influenced by dispersal from Tethyan sources.