Retikulumets

Retikulumets is a term used in speculative biology to denote a family of organ-like networks composed of interwoven cells and extracellular matrix that forms a reticulated mesh within an organism's body. The term combines reticulum, meaning a net, with a plural suffix used in fictional taxonomy.

The core unit is the retikulum, a three-dimensional lattice of branching filaments that create luminal channels. These networks conduct ions and nutrients, coordinate mechanical support, and host signaling molecules, enabling rapid distribution within tissues. Its mesh structure reduces diffusion barriers and can adapt its porosity in response to environmental cues.

In the published fictional literature, retikulumets are described in a range of taxa, including aquatic invertebrates and subterranean vertebrates. They typically arise in well-vascularized organs such as spiracles or central nervous systems; however, in some organisms they extend through multiple organ systems, forming a body-wide network.

Development begins with a population of progenitor cells that differentiate into a lattice-forming lineage. Evolutionarily, retikulumets are presented as convergent adaptations to preserve flow and signaling under stress, with variations in mesh density and channel size across species.

In fictional research contexts, retikulumets are studied for their mechanical resilience, transport properties, and potential for bioengineered tissues. The study of these networks informs material design and tissue engineering by suggesting network-based architectures and self-healing properties.