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Paratrygon aiereba (Müller & Henle, 1841): the senior synonym of the freshwater stingray disceus thayeri Garman, 1913 (chondrichthyes: potamotrygonidae)

Abstracts

A review of the original descriptions and available types of the South American freshwater stingrays Trygon aiereba Müller & Henle, 1841, Trygon strogylopterus Schomburgk, 1843 and Disceus thayeri Garman, 1913 indicates that these three nominal species are synonymous. The senior name, placed in the monotypic genus Paratrygon Duméril, 1865, established for Trygon aiereba, is available and valid. Based on its description, T. aiereba is a freshwater stingray. Therefore, this taxon is not the same as Raja ajereba Walbaum and Raja orbicularis Schneider, both names established for the marine "Aiereba" of Marcgrave, and which preferably should be treated as nomina dubia. Paratrygon does not replace Potamotrygon Garman, 1877 as the type genus, because the family name Potamotrygonidae Garman, 1877 has priority over Paratrygonidade Gill, 1893.


A revisão das descrições originais e dos tipos existentes das raias de água doce Trygon aiereba Müller & Henle, 1841, Trygon strogylopterus Schomburgk, 1843, e Disceus thayeri Garman, 1913, indica que essas três espécies nominais são sinônimas. O nome sênior, colocado no gênero monotípico Paratrygon Duméril, 1865, estabelecido para T. aiereba, é disponível e válido. A descrição de T. aiereba corresponde claramente a uma raia de agua doce; portanto esta espécie não é um sinônimo de Raja ajereba Walbaum e de Raja orbicularis Schneider, ambos os nomes propostos para a "Aiereba " marinha de Marcgrave, e que preferivelmente devem ser tratados como nomina dubia. Paratrygon não substitui Potamotrygon Garman, 1877 como gênero-tipo, porque o nome de família Potamotrygonidae Garman, 1877 tem prioridade sobre Paratrygonidae Gill. 1893.


Paratrygon aiereba (Müller & Henle, 1841): the senior synonym of the freshwater stingray disceus thayeri Garman, 1913 (chondrichthyes: potamotrygonidae)

Ricardo S. Rosa

Departamento de Sistemática e Ecologia, CCEN, Universidade Federal da Paraíba, 58059, João Pessoa, PE Present address: Department of Zoology, CW-312 Biological Sciences Centre, University of Alberta, Edmonton, Canada T6G 2E9

ABSTRACT

A review of the original descriptions and available types of the South American freshwater stingrays Trygon aiereba Müller & Henle, 1841, Trygon strogylopterus Schomburgk, 1843 and Disceus thayeri Garman, 1913 indicates that these three nominal species are synonymous. The senior name, placed in the monotypic genus Paratrygon Duméril, 1865, established for Trygon aiereba, is available and valid.

Based on its description, T. aiereba is a freshwater stingray. Therefore, this taxon is not the same as Raja ajereba Walbaum and Raja orbicularis Schneider, both names established for the marine "Aiereba" of Marcgrave, and which preferably should be treated as nomina dubia.

Paratrygon does not replace Potamotrygon Garman, 1877 as the type genus, because the family name Potamotrygonidae Garman, 1877 has priority over Paratrygonidade Gill, 1893.

RESUMO

A revisão das descrições originais e dos tipos existentes das raias de água doce Trygon aiereba Müller & Henle, 1841, Trygon strogylopterus Schomburgk, 1843, e Disceus thayeri Garman, 1913, indica que essas três espécies nominais são sinônimas. O nome sênior, colocado no gênero monotípico Paratrygon Duméril, 1865, estabelecido para T. aiereba, é disponível e válido. A descrição de T. aiereba corresponde claramente a uma raia de agua doce; portanto esta espécie não é um sinônimo de Raja ajereba Walbaum e de Raja orbicularis Schneider, ambos os nomes propostos para a "Aiereba " marinha de Marcgrave, e que preferivelmente devem ser tratados como nomina dubia. Paratrygon não substitui Potamotrygon Garman, 1877 como gênero-tipo, porque o nome de família Potamotrygonidae Garman, 1877 tem prioridade sobre Paratrygonidae Gill. 1893.

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ACKNOWLEDGEMENTS

I am indebted to the curators of the mentioned collections for kindly loaning specimens, to K. Hartel (MCZ) for making availabe the syntypes of D. thayeri, and to M. Goulding for making available his specimens at INPA. I thank P. Whitehead (formerly at BMNH) for a copy of the original painting of "Aiereba" and many valuable suggestions; R. V. Melville (BMNH) for his comments on nomenclature aspects. Dr. F. Terofal (ZSM) sent me information on the type of T. aiereba: Dr. H.-J. Paepke (ZMB) provided the photographs of the type of T. strogylopterus, H.P. Castello (MACN), a radiograph of the same specimen.

I also thank J. L. Figueiredo (MZUSP), M. Stehmann (ISH), M. Desoutter (MNHN), E. Fimpel and T. Miyake for bibliographic assistance. The manuscript was critically reviewed by P. Whitehead, M. Stehmann, J. A. Musick (VIMS), J. S. Nelson (UAMZ), J. D. McEachran (Texas A & M University), N. A. Menezes (MZUSP), N. Papavero (MZUSP), T. Roberts (CAS), L. J. V. Compagno (formerly at Tiburon Center for Environmental Studies), W. Raschi (formerly at VIMS), M. E. Anderson (CAS), and K. Sulak (formerly at VIMS).

This paper is part of a doctoral dissertation defended by the author at the Virginia Institute of Marine Science, College of William and Mary, Virginia. The study was financially supported by CAPES (Ministério da Educação, Brasil), CNPq (Ministério da Ciência e Tecnologia, Brasil), and VIMS.

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Publication Dates

  • Publication in this collection
    29 July 2009
  • Date of issue
    1990
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