The bivalves of early late Anisian (Middle Triassic) age from Leidapo (also Bangtoupo) in the northeastern vicinity of Qingyan in the south-central part of Guizhou Province, southwestern China (Fig. 1), are highly diverse and fairly well studied (e.g., Chen et al., 1974; Yin, 1974; Nanjing Institute of Geology and Palaeontology, 1976; Gan and Yin, 1978; also Stiller, 2001). The study of these Anisian fossil assemblages began with Koken (1900) and Hsu and Chen (1943). The renewed study of this site and its fossil assemblages by Stiller (1997, 2001) and Chen et...

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