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Brachypodosaurus
''Brachypodosaurus'' (meaning "short-footed lizard") is a dubious genus of possibly thyreophoran dinosaur from the Late Cretaceous Lameta Formation (Maastrichtian) in India.
The only remains discovered so far for this animal consist of a single fossil bone, excavated at the Chota Simla Hill near Jabalpur. In 1934, geologist Dhirendra Kishore Chakravarti, of the Geological Museum of the Banaras Hindu University, considered it a humerus, of a stegosaurian. He named it as the type species ''Brachypodosaurus gravis''. The generic name is derived from Greek βραχύς, ''brachys'', "short", and πούς, ''pous'', "foot". The specific name ''gravis'' means "heavy" in Latin.〔Chakravarti, D. K., 1934, "On a stegosaurian humerus from the Lameta beds of Jubbulpore", ''Quarterly Journal of the Geological, Mining, and Metallurgical Society of India'', 30; 75-79〕 Chakravarti hereby became the first local scientist to name a dinosaur.
The holotype is IM V9. The bone is over a foot long. Chakravarti based his identification of the element as a humerus on the presence of a large crest on the shaft, which he took for the deltopectoral crest. The status as a (dinosaurian) humerus is problematic. The bone is flat, has a crest on the other side of the shaft also, is not twisted around its longitudinal axis, is strongly constricted above and below the crests and lacks a clear ''caput'' or condyles. In any case, it lacks stegosaurian synapomorphies.〔Wilson, J. A., P. C. Sereno, S. Srivastava, D. K. Bhatt, A. Khosla, and A. Sahni. 2003. "A new abelisaurid (Dinosauria, Theropoda) from the Lameta Formation (Cretaceous, Maastrichtian) of India", Contributions from the Museum of Paleontology of the University of Michigan, 31:1–42〕 On the assumption it might at least be some member of the Thyreophora, it has been considered a possible ankylosaurian, the ankylosaurs being a sister group of the Stegosauria that survived into the Late Cretaceous. Even then, however, it was considered a ''nomen dubium'' as so few remains of the animal have been found.〔Maryanska T., 1977. "Ankylosauridae (Dinosauria) from Mongolia", Palaeontologia Polonica 37:85-151〕 In 2004, Matthew Lamanna e.a. considered it unlikely that any Ornithischia were present in the Maastrichtian of India.〔Lamanna, M.C., J.B. Smith, Y.S. Attia, and P. Dodson, 2004, "From dinosaurs to dyrosaurids (Crocodyliformes): removal of the post-Cenomanian (Late Cretaceous) record of Ornithischia from Africa", ''Journal of Vertebrate Paleontology'' 24: 764-768〕 The other Late Cretaceous genus from India originally described as a stegosaur, ''Dravidosaurus'', is also a ''nomen dubium'' based on plesiosaurian remains.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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