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Journal of Paleontology; November 2005; v. 79; no. 6; p. 1229-1233; DOI: 10.1666/0022-3360(2005)079[1229:ANSOAE]2.0.CO;2
© 2005 Paleontological Society
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PALEONTOLOGICAL NOTES

A NEW SPECIES OF ABERTELLA (ECHINOIDEA: SCUTELLINA) FROM THE GRAN BAJO DEL GUALICHO FORMATION (LATE EARLY MIOCENE–EARLY MIDDLE MIOCENE), RÍO NEGRO PROVINCE, ARGENTINA

SERGIO MARTINEZ1, VALERIA REICHLER2 and RICH MOOI3

1 Facultad de Ciencias, Departamento de Evolución de Cuencas, Iguá 4225, (11400) Montevideo, Uruguay, <smart@fcien.edu.uy>
2 Museo Argentino de Ciencias Naturales Bernardino Rivadavia, División Paleoinvertebrados, Angel Gallardo 470, (C1405DJR) Buenos Aires, Argentina, <valereichler@ciudad.com.ar>
3 California Academy of Sciences, Golden Gate Park, San Francisco, California 94118-4599, <rmooi@CalAcademy.org>

The first 20% of the full text of this article appears below.


   INTRODUCTION
 
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).

In his 1953 paper, Durham also named to Abertella the following species: S. floridana Cooke, 1942 from Florida; S. cazonesensis Kew in Dickerson and Kew, 1917 from California; and S. habanensis Sanchez Roig, 1949 from Cuba. After creating the family Abertellidae, Durham (1955) felt that Echinarachnius sebastiana Jackson, 1922 (from Puerto Rico) might also be referable to Abertella as he conceived it. Durham (1957) also named Abertella palmeri from Guatemala and A. kewi from Chiapas, Mexico, whereas Cooke (1959) eventually synonymized his own S. floridana with A. aberti.

The most recent species to be placed in the genus was A. complanata Brito, 1981, found . . . [Full Text of this Article]






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