Plagiosternum
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| Plagiosternum Fossil range: Middle Triassic |
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 Plagiosternum granulosum skull.
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Fossil
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Plagiosternum (plae-jee-oh-ster-num, meaning "sideways breastbone") was a poorly known middle Triassic amphibian that is native to Spitsbergen. Its feeding habit was believed to be raising its head underwater to suck in fish. The muscles that opened its mouth were strong, but the ones that closed them were weak. It is also believed that it had external gills, like those in a Carboniferous microsaur lepospondyl, Microbrachis, and in some salamanders, such as axolotls and mudpuppies, that live today.
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