WASHINGTON : The South American lungfish is an extraordinary creature - in some sense, a living fossil.
FILE PHOTO: A South American lungfish, whose scientific name is Lepidosiren paradoxa, is seen at a laboratory at the Louisiana State University in Baton Rouge, Louisiana, U.S., March 18, 2024.
"Our analyses revealed that the South American lungfish genome grew massively during the past 100 million years, adding the equivalent of one human genome every 10 million years," said evolutionary biologist Igor Schneider of Louisiana State University, one of the authors of the study published this week in the journal Nature.
Until now, the largest-known animal genome was that of another lungfish, the Australian lungfish, Neoceratodus forsteri. The South American lungfish's genome was more than twice as big. The world's four other lungfish species live in Africa, also with large genomes. The South American lungfish reaches up to about 4 feet long. While other fish rely upon gills to breathe, lungfish also possess a pair of lung-like organs. It lives in oxygen-starved, swampy environs of the Amazon and Parana-Paraguay River basins, and supplements the oxygen gotten from the water by breathing in oxygen from the air.
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