Peces Criollos - Freshwater Fishes of Argentina Peces Criollos - Freshwater Fishes of Argentina
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Plagioscion macdonaghi is a jr. synonym of P. ternetzi

Plagioscion macdonaghi   Daneri, 1954
is a junior synonym of
Plagioscion ternetzi   Boulenger, 1895

published in:
Casatti, L. (2005):
Revision of the South American freshwater genus Plagioscion (Teleostei, Perciformes, Sciaenidae).
Zootaxa 1080: 39–64

abstract (from publication):
The South American freshwater sciaenid genus Plagioscion is reviewed. Five of the 15 nominal species assigned to the genus are considered to be valid: Plagioscion squamosissimus, widely distributed in Atlantic drainages east of the Andes; P. auratus from the Río Orinoco and Río Amazonas basins; P. magdalenae from the Río Magdalena and Río Amazonas basins; P. ternetzi from the lower Río Paraná, Río Paraguay and Río Uruguay basins; and P. montei from the Río Amazonas basin.

remarks (from publication):
Daneri described P. macdonaghi from the Río de La Plata, based on a juvenile specimen (113.0 mm). The diagnostic characters emphasized by Daneri (depth of body, interorbital width, horizontal orbit diameter, and number of gill rakers) all fall within the range of those values for P. ternetzi.
This justifies the recognition of P. macdonaghi as a junior synonym of the latter species.

further remarks:
This synonymy has been proposed earlier by L. Braga and M. Azpelicueta (1982), but this paper was ignored by later authors from Argentina (e.g. López et al. 1987, 2003) and probably was unknown to Casatti (2005). 
published in:
Azpelicueta, M. & L. Braga (1982):
Estudio sobre Plagioscion ternetzi Boulenger, 1895 (Perciformes, Sciaenidae). Parte I.
Neotrópica 28 (79): 7-18 
&
Braga, L. & M. Azpelicuieta (1982):
Estudio sobre Plagioscion ternetzi Boulenger, 1895 (Perciformes, Sciaenidae). Parte II.
Neotrópica 28 (80): 103-116

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