国际研究团队近日鉴定了一具距今约2.4亿年的新物种化石，命名为异牙龙（Dinodontosaurus isiyavamanda），这一发现改写了恐龙演化时间线1。该化石于1963年由英国远征队从坦桑尼亚采集，随后由伦敦自然历史博物馆保存了60多年，直到最近才被正式鉴定1。相关研究成果已于2026年9月15日发表在《脊椎古生物学杂志》上1。
这一发现具有重要的科学意义。异牙龙的发现首次确认二齿龙属在南美洲之外存在1。通过关联坦桑尼亚和南美洲的含化石岩层，研究团队表明坦桑尼亚曾认为是最古老的恐龙化石实际上比原估计年轻约1000万年1，这一时间修正对现有的恐龙演化认知产生了重要影响。
An international research team has identified a previously unknown species from a 240-million-year-old fossil discovered in Tanzania, fundamentally altering scientists' understanding of early dinosaur chronology.1 The newly named species, Dinodontosaurus isiyavamanda, represents the first confirmed presence of the Dinodontosaurus genus outside South America.1 The fossil, a composite skeleton originally collected by a British expedition in 1963, has been housed in the Natural History Museum in London for more than six decades before its recent analysis.1
The discovery carries significant implications for dating the earliest dinosaur fossils in the African region.1 By correlating fossil-bearing rock layers in Tanzania with corresponding formations in South America, researchers determined that Tanzania's previously presumed oldest dinosaur fossils are approximately 10 million years younger than earlier estimates suggested.1 The findings were published on September 15, 2026, in the Journal of Vertebrate Palaeontology.1
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