Published in Palaeontology, in 1979, in volume 22, issue 3, pages 609-630

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Published in Paleontological Research, in 1998, in volume 2, pages 130-136

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Published in Paleontological Research, in 2001, in volume 5, pages 311-318

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Published in Paleontological Research, in 2001, in volume 5, pages 277-282

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Published in Paleontological Research, in 2001, in volume 5, pages 13-19

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Published in Zoologica, in 1939, in volume 24, issue 13, pages 293-295

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Published in Zoological Science, in 1991, in volume 8, pages 639-651

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Published in Zoological Science, in 1994, in volume 11, pages 847-853

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Published in Veliger, in 2002, in volume 45, pages 316-330

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Published in Zoological Science, in 1990, in volume 7, pages 443-447

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Published in Zoological Science, in 1992, in volume 9, pages 1017-1023

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Published in Alytes, in 1994, in volume 12, issue 1, pages 1-14

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Published in Zoological Science, in 1993, in volume 10, pages 53-56

Created: 2012-09-19, modified: 2012-09-19

Published in Proceedings of The Biological Society of Washington, in 2002, in volume 115, pages 205-216

Created: 2011-07-27, modified: 2011-07-27

Published in Zoological Science, in 1990, in volume 7, pages 485-515

Created: 2012-09-19, modified: 2012-09-19