A time lapse series of regular contraction of our lab pet Tethya wilhelma (Demospongiae). This movie is an electronic supplement to the publication Nickel, M (2010), "Evolutionary emergence of synaptic nervous systems: what can we learn from the non-synaptic, nerveless Porifera?", Invertebrate Biology, 129: 1-16 .
Copyright by M. Nickel; no unauthorised copying, distribution or broadcasting. Feel free to use it for teaching purpose.