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Crassigyrinus was an amphibian from the early Carboniferous period of Scotland. It is known from two specimens. The complete one is only missing its tail, which was probably long for better swimming. Crassigyrinus had small, very weak limbs that were virtually useless, therefore, this amphibian was almost completely aquatic. Some scientists regard Crassigyrinus as a reptiliomorph. Crassigyrinus had unusually large jaws, and ate any other animal it could catch and swallow. It had two rows of sharp teeth in its jaws, the second row having a pair of fangs. Crassigyrinus had large eyes, suggesting that it was either nocturnal, or lived in very murky water. It possessed large otic (spiracular) notches, probably accommodating a spiracle rather than a tympanic membrane[1]
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