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. 2008 Jan 11;363(1496):1425–1434. doi: 10.1098/rstb.2007.2232

Figure 3.

Figure 3

Basal metazoan fossils. (a) Eiffelia globosa from the Middle Cambrian Burgess Shale (ROM 57023); 3.0× (Botting & Butterfield 2005). As well as the prominent hexaradiate spicules typical of calcarean sponges, rows of smaller, hexactinellid-like tetraradiate spicules are also visible (arrowed). (b) A section of Sinocyclocyclicus guizhouensis from the Ediacaran Doushantuo Formation (Xiao et al. 2000; Liu et al. in press); 75×. This small, branching tabulate fossil has been interpreted as being a potential stem-group cnidarian. (a) Courtesy of N. J. Butterfield. (b) Courtesy of Shuhai Xiao.