Radiolarians, including the new species Entactinia pailinensis Ito n. sp., were obtained from the Pailin area, western Cambodia. The radiolarians indicated an age around the Asselian–Sakmarian of the Cisuralian (early Permian). The new species is characterized by an evenly-sized-porous exosphere composed of a polygonal outer porous plate and circular inner porous plate with some radial outer spines. A previous study concluded that Entactinia Foreman rapidly expanded in the early–middle Cisuralian. Our discovery of this new species adds further occurrence data of Entactinia in the early–middle Cisuralian. In addition, another previous study highlighted the uneven distribution of Pseudotormentus De Wever and Caridroit compared with the wider distribution of Quadriremis Nazarov and Ormiston through the Permian, in particular the Guadalupian (middle Permian). Our results combined with those of previous studies indicate that the uneven distribution might extend back to the Sakmarian of the Cisuralian at least.

放射虫，包括新物种Entactinia pailinensis伊藤n。种，从柬埔寨西部的拜林地区获得。放射虫表示大约在Cisuralian（早二叠纪）的Asselian-Sakmarian年龄。新物种的特征是均匀大小的多孔外层，其由多边形的外部多孔板和圆形的内部多孔板组成，带有一些放射状的外部刺。先前的一项研究得出结论，Entactinia工头在早期中西奥拉期人中迅速扩张。我们对这一新物种的发现增加了早期中西奥拉人的恩替克氏菌的进一步发生数据。此外，先前的另一项研究强调了假性金眼狼的分布不均De Wever和Caridroit与Quadriremis Nazarov和Ormiston通过二叠纪，特别是瓜达卢普（中二叠纪）的分布比较广泛。我们的结果与先前的研究结果相结合表明，分布不均至少可以扩展到西索里亚人的萨克曼人。