Classification
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Gastrophryne - North American Narrow-mouthed Toads
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Gastrophryne olivacea - Western Narrow-mouthed Toad
- G. o. mazatlanensis - Mazatlan Narrow-mouthed Toad
- G. o. olivacea - Western Narrow-mouthed Toad
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Gastrophryne olivacea - Western Narrow-mouthed Toad