Copyright by porifera.net lab, Conny Heer & Jörg Hammel; no unauthorised copying, distribution or broadcasting. Feel free to use it for teaching purpose.
If you are interested in bud development of Tethya wilhelma, check our recent article in Frontiers in Zoology:
Hammel JU, Herzen J, Beckmann F, Nickel M (2009) Sponge budding is a spatiotemporal morphological patterning process: Insights from synchrotron radiation-based x-ray microtomography into the asexual reproduction of Tethya wilhelma. Frontiers in Zoologie 6:19;