South American lungfish, Lepidosiren paradoxa. Is the single species of lungfish found in swamps and slow-moving waters of the Amazon, Paraguay, and

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Paulo Oliveira / Alamy Stock Photo
lower Paraná River basins in South America. Its a air-breather and the sole member of Lepidosirenidae family. The gills are greatly reduced and essentially non-functional in the adults. The young become air-breathing at about seven weeks. Juveniles have external threadlike gills very much like those of newts. From Amazonas