Phylogeny and classification of Permian Radiolarians

利用四国岛中部奇奇布地体的磷酸盐结核和新西兰怀帕地体的石灰岩和硅质岩样品，对晚二叠世放射虫动物群的分类及其动物群组成进行了研究。研究结果如下：1.利用扫描电子显微镜对晚二叠世白垩纪的内部结构进行了观察。对二叠纪Albaillella属、Pseudoalbaillella属、Follicuculus属和Neoalbaillella属的系统发育关系和分类进行了研究。在奇奇布地体的磷酸盐结核的动物群中观察到了几组未知的放射虫。其中大部分可归为新属。由于内部结构难以观察，对这些群体的研究仍在继续。报道了Waipapa地体北部的中、晚二叠世放射虫，以及由几乎连续的玄武岩和灰岩、层状硅质岩和硅质泥岩组成的箭头岩的详细岩石地层学。中、晚二叠世放射虫产于石灰岩透镜体和箭岩中的层状硅质岩中(Takemura等人，在出版中)。本文描述了箭岩石灰岩透镜体中保存完好的放射虫，其中包括Follicuculus属的两个新种：F.sphaericus和F.whangaroaensis(Takemura等人，正在提交)。此外，早、中三叠世放射虫出现在箭岩的硅质泥岩中，箭岩中的黑色页岩单位可与二叠系/三叠系界线对比。

A phosphate nodule from Chichibu Terrane in central Shikoku and limestone and chert samples from the Waipapa Terrane, New Zealand were used in this research to clarify the taxonomy of Late Permian radiolarian fauna and their faunal composition. The results of this research are the follows :1. Observations of internal structures of Late Permian albaillellarians were made using scanning electron microscope. Phylogenetic relationships and classification of Permian genera Albaillella, Pseudoalbaillella, Follicucullus and Neoalbaillella are examinated.2. Unknown radiolarians of several groups were observed in the fauna from the phosphate nodule from Chichibu Terrane. Most of them can be classified as new genera. Because it is difficult to observe internal structures, the research of these groups is still continued.3. Middle to Late Permian radiolarians from the northern part of Waipapa Terrane were reported, as well as the detailed lithostratigraphy of Arrow Rocks composed of an almost continuous section of basalts with limestones, bedded cherts and siliceous mudstones. Middle to Late Permian radiolarians occurred in a limestone lens and bedded chert from Arrow Rocks (Takemura et al., in press).4. Well-preserved albaillellarians from the limestone lens in Arrow Rocks were described including two new species of Genus Follicucullus, F.sphaericus and F.whangaroaensis (Takemura et al., now submitting).Other than these results, Early to Middle Triassic radiolarians occurred in siliceous mudstones from Arrow Rocks, and black shale unit in Arrow Rocks can be correlated with Permian/Triassic boundary.