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A new species of Abertella (Echinoidea: Scutellina) from the Gran Bajo del Gualicho Formation (Late Early Miocene–Early Middle Miocene), Río Negro Province, Argentina

Published online by Cambridge University Press:  20 May 2016

Sergio Martinez ,
Valeria Reichler  and
Rich Mooi
Sergio Martinez
Affiliation:
Facultad de Ciencias, Departamento de Evolución de Cuencas, Iguá 4225, (11400) Montevideo, Uruguay,
Valeria Reichler
Affiliation:
Museo Argentino de Ciencias Naturales Bernardino Rivadavia, División Paleoinvertebrados, Angel Gallardo 470, (C1405DJR) Buenos Aires, Argentina,
Rich Mooi
Affiliation:
California Academy of Sciences, Golden Gate Park, San Francisco, California 94118-4599,
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Extract

The genus Abertella Durham, 1953 initially was described to include one of several problematic species of Miocene sand dollars originally placed in Scutella Lamarck, 1816. Durham (1953) named Scutella aberti Conrad, 1842 as the type of Abertella, and later (1955) tried to resolve issues concerning familial relationships of North American scutellines by placing the genus in a monogeneric family, the Abertellidae. Durham (1953, p. 351) separated Abertella from other members in his assemblage of taxa related to Scutella because the former has: 1) an immediately submarginal periproct between the second pair of post-basicoronal plates; 2) moderately closed petaloids about three-quarters the length of the corresponding aboral ambulacrum (although he states this ratio as being two-thirds in the description itself); 3) widely disjunct oral interambulacra; 4) ambulacral basicoronals that are larger than interambulacral basicoronals (misstated, and corrected to say just the reverse in Durham [1955]); and 5) a well-developed notch in the posterior margin of the test. Abertella aberti (Conrad, 1842) is known from the coastal Miocene of the eastern United States, notably Maryland, North Carolina, and Florida (Durham, 1953; Cooke, 1959; McKinney, 1985).

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 79 , Issue 6 , November 2005 , pp. 1229 - 1233
Copyright
Copyright © The Paleontological Society 

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