Lower Devonian vertebrates, arthropods and brachiopods from northern Vietnam |
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Authors: | Patrick R Racheboeuf Ta Hoa Phuong Wang Shang-Qi |
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Institution: | a UMR 6538 du CNRS, Laboratoire de Paléontologie, Université de Bretagne Occidentale, Avenue Le Gorgeu, BP 809, 29285 Brest cedex, France b UMR 5143 du CNRS, Laboratoire de Paléontologie, Muséum National d'Histoire Naturelle, 8, rue Buffon, 75005 Paris, France c Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, Grande-Bretagne, UK d Department of Geology, Vietnam National University at Hanoi, 334, Nguyên Trai Road, Thanh Xuan, Hanoi, Vietnam e UMR 5125 du CNRS, Paléoenvironnements et Paléobiosphère, Université Claude Bernard Lyon-1, Bâtiment Geode, 2, rue Raphaël Dubois, 69622 Villeurbanne cedex, France f Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, East Beijing Road 39, Nanjing 210008, China |
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Abstract: | Additional vertebrates and ostracods from the bituminous shale of the Khao Loc Formation at Tong Vai, Ha Giang Province, northern Vietnam, corroborate its correlation with the upper part of the Xishancun (Xiaxishancun) Formation and the lower part of the Xitun and Lianhuashan formations of South China, and its Middle to Late Lochkovian age. The variations in morphology and ornamentation of the galeaspid Polybranchiaspis liaojaoshanensis from Tong Vai are discussed and regarded as possibly size and growth-related. A new acanthothoracid placoderm with a very deep dorsal process is described from Tong Vai and the specific distinction between the antiarchs Minicrania lissa from Tong Vai and M. lirouyii from Yunnan is supported by additional characters. Petalichthyid placoderms are recorded from this locality for the first time, and the skull of a juvenile youngolepidid sarcopterygian is described. Eurypterid fragments and a phyllocarid crustacean are also recorded from the Khao Loc Formation. A new species of the chonetid brachiopod genus Tulynetes, endemic to northern Vietnam, is described from the Pragian Mia Le Formation at Cu Le, Bac Kan Province, a new locality which yields a large diversity of taxa with outstanding preservation. |
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Keywords: | Lower Devonian Biostratigraphy Brachiopoda Vertebrata Ostracoda Eurypterida Phyllocarida Vietnam |
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