Spatiotemporally stable solutions have been found for nonlinear partial integro differential equation systems including diffusion. These mathematical systems were origi nally derived from an immunological problem of the modelling of an inflammation process. An extended system is able to form quasi-stable particles marked by a characteristic internal structure and dynamics of this structure. Properties of such particles are investigated by employing a selected set of system parameters. The system driving parameter is chosen as a control parameter. Increasing this parameter steadily, the system crosses some bifurcation points connected with a catastrophic change of state of the particle. The particle finally becomes chaotic. A new route to chaos occurs on this occasion. The particle emits a weak space wave. Different outcomes of the model runs are discussed. §1. Introduction and model description In 1984, Sonne mann 1) found a spatiotemporally stable solution in the form of a stable spherical colony of bacteria or viruses in connection with the solution of a special, very simple five-component system describing immunologic processes. The system is simple in terms of the medical background. It also describes the balance between bacteria or viruses or cancer cells and their antibodies. In order to model an inflammation, a local focus of infection was assumed. The infecting germs spread diffusively through the tissue and the antibodies annihilate them there. The cru cial point of this system is the assumption that the production rate of antibodies depends on the total number of infecting germs. In other words, the system was characterized by a global coupling. This assumes the form of an autonomous partial integro-differential equation system and, in view of the less advanced computer tech nology existing 15 years ago, it was solved at that time in only one space coordinate, formulated in polar coordinates. For a certain set of system parameters, the solution runs into a non-trivial spatiotemporaUy stable dissipative structure ~ also called a spotted pattern~, localized domain, or autosoliton. Modern computers allow for the investigation of such systems in three dimen sions. The new three-dimensional calculations confirm the results found 15 years ago. This paper deals, above all, with an extended system marked by characteris tic internal feedback. The system forms particles characterized by distinct internal structure and dynamics. The investigation of problems marked by global coupling has experienced grow ing interest. If we consider nonlinear systems of ordinary differential equations, nonlinear systems of partial differential equations, and, in this connection, in par