Abstract
Populations of the clam shrimp, Eulimnadia texana, exhibit androdioecy, which is a mixed mating system comprised of males and self-compatible hermaphrodites. Such mating systems have been suggested to be unstable, and yet most populations of E. texana appear to exhibit this mixed strategy. Herein we present genetic and sex ratio information on seven populations of these shrimp that confirm that the majority of these populations show a mixture of inbreeding and outcrossing modes of reproduction. Additionally, we suggest that the relationship of inbreeding rate with male frequency indicates that mating is not random, as suggested in a previous model of E. texana‘s mating system.