Figure 4 from: Bertolino M, Cerrano C, Bavestrello G, Carella M, Pansini M, Calcinai B (2013) Diversity of Porifera in the Mediterranean coralligenous accretions, with description of a new species. ZooKeys 336: 1-37. https://doi.org/10.3897/zookeys.336.5139

Figure 4 - Cliona burtoni. A–C Tylostyle heads D–L Spirasters of various shape and thickness.