Diversification events of marine, brackish and freshwater bivalves in the Early Cretaceous

对早白垩世双壳类标本进行了分析，发现来自日本的双壳类标本和中国的相关标本。海水、微咸水和淡水双壳类具有不同的分散性和多样性。对日本血吸虫属的分类分析表明，早白垩世日本血吸虫物种的出现和多样化是延泽地块和中朝地块东部侧向断裂位移形成廊道状水道的结果。另一方面，海洋双壳类受到全球环境变化的影响。与这些狭盐生境不同的是，河口被泛盐生双壳类占据。Tetorla sanchuensls是一种早期的异齿双壳类，具有长虹吸管，被发现生活在河口的最下部。

Early Cretaceous bivalves were analyzed for specimens from Japan and related part of China. Marine, brackish and freshwater bivalves displayed different pattern of dispersion and diversification. Taxonomic analysis of the genus Nippononaia has shown that the emergence and diversification of the Early Cretaceous species are the result of corridor-like waterway formed by the displacement of lateral faults in the eastern part of the Yanze and Sino-Korea blocks. Marine bivalves, on the other hand, were influenced by global environmental changes. In contrast to these stenohaline habitats, estuaries were colonized by euryhaline bivalves. Tetorla sanchuensls, one of the early heterodont bivalves having long siphons, was found to have inhabited in the nnermost part of estuary.