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Fifteen of 20 gonochoristic Artemia populations are crossfertile with diploid San Francisco shrimps, producing fertile F1 and viable F2 progeny. Partial sex linkage of white eye was observed and frequency of crossing over between the white and sex loci did not exceed the range of values observed in San Francisco shrimps. Possible mechanisms for wide dispersal of this diploid genotype are discussed. Five populations are reproductively isolated from San Francisco shrimps: Mono Lake, Hidalgo, Lake Urmia, San Bartolomeo, and Tunisia. The last two are inter-fertile.

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