摘要: An isolated large temnospondyl tooth was discovered from the Middle Triassic
Tongchuan Formation, Weibei Oilfield, Ordos Basin, Shaanxi Province of China. Compared
with the teeth of crocodylomorphs, plesiosaurs and temnospondyls, the tooth can be referred to
temnospondyl based on the following features: the crown is elongated and recurved with a circular
cross-section; there are no denticles or carinae on the crown; well-marked apicobasal grooves are
shown on the crown surface. This tooth represents the first temnospondyl found in the Middle
Triassic Tongchuan Formation and is the youngest fossil record of temnospondyls in the North
China Block.