Abstract
Three populations of Artemia from La Pampa Province, Argentina, were cytogenetically analyzed: Salinas Grandes de Hidalgo, Laguna Callaqueo, and Laguna Colorada Chica. Both mitotic and male meiotic chromosomes were studied. All 3 populations share the same diploid (2n = 44) and/or haploid chromosome number (n = 22), and hence were determined as Artemia persimilis Piccinelli and Prosdocimi. Although bivalents decrease gradually in size, differences among the larger and the smaller ones were apparent. So far, no cytogenetic differences have been detected among the 3 populations. Chromosomes with metacentric, submetacentric, and telocentric morphology were detected in mitotic prometaphase cells, suggesting that chromosomes of Artemia may be monocentric. The anostracan genus Artemia is taxonomically regarded as a group of several reproductively isolated sibling species, distributed worldwide, except for the Antarctic continent. In the New World, the genus is represented by three endemic bisexual species: A. franciscana Kellogg, 1906, A. persimilis Piccinelli and Prosdocimi, 1968, and A. monica Verrill, 1869.
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