A Coleonyx brevis

An amphibian was a species of cold-blooded vertebrates. They spent part of their time on land but were still required to immerse themselves in fresh water the other half of their time.

When Counselor Deanna Troi was affected by Barclay's Protomorphosis Syndrome in 2370, she de-evolved into an amphibian, complete with gills. (TNG: "Genesis")

When Tom Paris underwent a phase of hyper-evolution after reaching Warp 10 in 2373, he rapidly evolved into an amphibian lifeform. (VOY: "Threshold")

Types of amphibians

Sentient amphibian species

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