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。前額骨存在於大多數現代和滅絕的肺魚、兩棲動物和爬行動物中。 前額骨結構在早期哺乳動物中丟失,因此在現代哺乳動物中也不存在。 Cloutier, Richard; Ahlberg, PerE. Morphology, characters, and the interrelationships of basal sarcopterygians
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