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Incisors 5/4 (Fig. 1); tail naked, scaly, and prehensile, basal one-third black, distal two-thirds white; hind foot with opposable big toe (Fig. 2); females with pouch (marsupium) on belly enclosing mammary area
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Incisors 3/3 or fewer; tail not as above, if scaly then neither prehensile nor bicolored; big toe not opposable; no pouch on belly of females
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