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SUMMARY
The karyotypes of Kinosternon scorpioides scorpioides and Kinosternon scorpioides carajasensis show 56 chromosomes at mitosis, 28 bivalents at meiosis, and no heterochromosomes. This number is exactly the double of that observed in four species of Chelonia of the genus Podocnemis but it is within the range commonly described for animals of this Order (50–64). Heterochromatic regions were a frequent finding at interphasic nuclei and in the early stages of meiotic prophase.