Additional Occurrences of Urushtenoidea (Brachiopoda) from the Permian of Asia

概要

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Quite recently Jing and Hu (1978) proposed two new brachiopod genera, Urushtenoidea and Uncisteges, in which they grouped certain species formerly included in the genus Urushtenia established by Licharew in 1935. As a matter of fact, Sarytcheva and Grunt (1969) documented the presence of some essential differences between Urushtenia and several species which were transferred to the newly presented genera by jing and Hu, but no generic name for them was proposed by the Russian authors at that time. In the author's opinion, both Urushtenoidea and Uncisteges appear to be distinct from Urushtenia at least in generic rank. The former two, however, may be congeneric with each other, and the generic validity of Uncisteges must be denied in that case. In addition to the morphological difference, the stratigraphic and geographic distributions between Urushtenia and Urushtenoidea are quite different. Urushtenoidea is restricted in its geographic distribution to Southeastern Eurasia and ranges in age from Artinskian through Guadalupian. In the present paper, several additional occurrences of certain species belonging to this genus known to exist in Japan, Cambodia and Laos are presented.
北海道大学 = Hokkaido Universityの論文