Comparison of the diameter of the frontal knobs in Artemia urmiana Günther, 1899 (Anostraca)

[In four samples of Artemia urmiana Gunther, 1899 from Urmia Lake, Iran, the following parameters were compared: the diameter of the frontal knobs (right and left), and the respective ratios of that diameter with total body length and head width. The results do not denote significant differences in frontal knob diameter that would agree with similar results observed in frontal knob diameter in populations of A. franciscana Kellogg, 1906 and A. persimilis Piccinelli & Prosdocimi, 1968. However, we report differences in the other parameters studied for each of the populations studied, that could be explained by the environmental heterogeneity of the studied site. Ecological, biogeographical, and systematic issues related with the results are discussed. Para cuatro poblaciones de Artemia urmiana Gunther, 1899 del lago Urmia, Iran, se compararon los siguientes parametros: diametro de los lobulos frontales (derecho e izquierdo), y las razones respectivas de los diametros con el largo total del cuerpo y el ancho de la cabeza. Los resultados no mostraron diferencias significativas entre los diametros del lobulo frontal, lo cual seria similar a resultados observados para poblaciones de A. franciscana Kellogg, 1906 y A. persimilis Piccinelli & Prosdocimi, 1968. Por otro lado, hubo diferencias significativas para los otros parametros estudiados para las poblaciones estudiadas, lo cual se deberia a la heterogeneidad ambiental del sitio estudiado. Se discutieron topicos de ecologia, biogeografia y sistematica relacionados con los resultados obtenidos en el presente estudio., In four samples of Artemia urmiana Gunther, 1899 from Urmia Lake, Iran, the following parameters were compared: the diameter of the frontal knobs (right and left), and the respective ratios of that diameter with total body length and head width. The results do not denote significant differences in frontal knob diameter that would agree with similar results observed in frontal knob diameter in populations of A. franciscana Kellogg, 1906 and A. persimilis Piccinelli & Prosdocimi, 1968. However, we report differences in the other parameters studied for each of the populations studied, that could be explained by the environmental heterogeneity of the studied site. Ecological, biogeographical, and systematic issues related with the results are discussed. Para cuatro poblaciones de Artemia urmiana Gunther, 1899 del lago Urmia, Iran, se compararon los siguientes parametros: diametro de los lobulos frontales (derecho e izquierdo), y las razones respectivas de los diametros con el largo total del cuerpo y el ancho de la cabeza. Los resultados no mostraron diferencias significativas entre los diametros del lobulo frontal, lo cual seria similar a resultados observados para poblaciones de A. franciscana Kellogg, 1906 y A. persimilis Piccinelli & Prosdocimi, 1968. Por otro lado, hubo diferencias significativas para los otros parametros estudiados para las poblaciones estudiadas, lo cual se deberia a la heterogeneidad ambiental del sitio estudiado. Se discutieron topicos de ecologia, biogeografia y sistematica relacionados con los resultados obtenidos en el presente estudio.]

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