Poroisten

Poroisten is a term used in speculative biology and related fiction to describe a hypothetical group of organisms defined by a highly porous body architecture. In this concept, the body comprises an interconnected network of cavities and channels that pervade tissues and exoskeletons, yielding a large internal surface area relative to volume. Proponents argue that such porosity would support rapid diffusion of nutrients, gases, and waste, enabling efficient exchange in environments where compact body plans are advantageous.

Typical assumed features include a porous skeleton or integument, a flexible yet robust matrix, and mechanisms to regulate internal fluid or gas pressures to modulate buoyancy or flotation. Morphology could range from sponge-like masses to lattice frameworks comparable to foams. The concept is primarily a theoretical construct used in discussions about diffusion-limited life, bio-inspired materials, and world-building in science fiction. There is no consensus or empirical evidence for real organisms meeting these criteria, and the term is not part of formal biological taxonomy.

In practice, poroisten are cited as thought experiments or design analogies for porous materials such as metal foams, ceramic foams, or hydrogels, bridging biology and materials science. They also appear in speculative fiction as a class of life with rapid exchange capabilities and unusual ecological strategies. The idea remains largely exploratory and is not used as a classification in mainstream biology.