Bulinidae (Gastropoda) from the Paleogene Anjihaihe Formation on the southwest margin of the Junggar Basin, Xinjiang
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Abstract:
Gastropod fossils are abundant in the Anjihaihe Formation of the Junggar Basin, Xinjiang, northwestern China. In this study, five species were described belonging to the family Bulinidae. The specimens were collected from the mid dle member of the Anjihaihe Formation at the Kuitunhe section on the southwestern margin of the Junggar Basin. These five species, including two new species, belong to two genera of the family Bulinidae: Sinoplanorbis sinensis (Odhner), Sinoplanorbis junggarensis sp. nov., Sinoplanorbis intermedia Yü et Pan, Hopeiella kuitunensis sp. nov., and Hopeiella alticonica Youluo. Both genera, Sinoplanorbis and Hopeiella, are endemic to China and are mainly distributed in the up per Eocene to lower Oligocene strata in the provinces of Shanxi, Guangxi, Jiangxi, Henan, and Hebei, as well as in the coastal areas of the Bohai Sea. The known species Sinoplanorbis sinensis (Odhner), Sinoplanorbis intermedia Yü et Pan, and Hopeiella alticonica Youluo have also been reported from the upper part of the fourth member of the Shahejie For mation and the Dongying Formation (upper Eocene to lower Oligocene) along the coastal areas of the Bohai Sea. Based upon the geographical distribution and stratigraphic occurrence of Sinoplanorbis and Hopeiella, as well as the stratigraph ic range of these species, the geological age of the middle member of the Anjihaihe Formation is inferred to be late Eocene–early Oligocene.
