The value of 2n=46, which has been considered ancestral for Balistidae, Ostraciidae, Tetraodontidae and Diodontidae, and not detected previously in any representative of the family Tetraodontidae, is the diploid number presented by S. greeleyi and S. spengleri, tetraodontids that occur in sympatry along the Brazilian coast.
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Brurm et al. (1995) studied this question.
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