Fig. 2 in Applications and limitations of micro-XCT imaging in the studies of Permian radiolarians: A new genus with bi-polar main spines

Fig. 2. Micro-XCT cross-sectional images (A, B), SEM micrographs (C–E), and TLM micrographs (F) of the spumellarian Tetraspongodiscus stauracanthus Feng in Feng et al., 2006 from Changhsingian of the Rencunping section (A–D) and Dongpan (E), South China and upper Capitanian of West Texas, USA (F). A. LGFEC SR 33-201. B. LGFEC SR 33-202. C. LGFEC SR 36-011. D. LGFEC SR 33-022. E. DP 4/4860 (from Feng et al. 2006; copyright is permitted from Elsevier). F. S3-2A (from Noble and Jin 2010). Different cross sections show clear hoops with few primary beams and a possible median bar (A1 and B1), the centrical internal spicule (A2), and the embedded proximal part of the main spines (B2). Scale bars 50 μm.