【摘要】 Pyotopalaeaster?sinensis sp.nov.属Hudsonasteridae,仅一块显示腔内水管系统痕的标本,标本小,五个腕,中央盘不明显,每一腕有下缘板11—12对。辐管明显,辐管两侧有侧管和成对的壶腹囊,显示了与现代海星交错排列的壶腹囊的区别。在每两个腕的掖部出现波里氏囊。未见中央环状水管。说明Hudsonasteridae科肯定有壶腹囊水管系统。标本采自浙江省江山县上奥陶统长坞组中部。共生化石有:Remopleurides,Ampyxinella和Climacograptus ap.大约相当于Dicellograptus szechuanensis带的层位。更多还原

【Abstract】 Protopalaeaster?sinensis sp. nov. belongs to Hudsonasteridae. Only one specimen shows cavity marks in the water vascular system. This specimen is small and has five arms, disc being not clear, with 11—12 couples of inframarginals. Radial canals are obvious, and there are lateral canals with couples of ampullae on both sides of the radial canals. It is different from the ampullae of living asterozoids which are overlapped in arrangement. There are Polian vesicles under the arm pit of every two arms, the ring canal being seen. These indicate that Hudsonasteridae has the ampullae of the water vascular system. This specimen was collected in the middle part of the Upper Ordovician Changwu Formation in Jiangshan, western Zhejiang. Associated fossils include Remopleurides, Ampyxinella and Climacograptus sp. They are from a horizon overlying the Dicellograptus szechuanensis zone.更多还原