Biodiffusor: Organisms whose activities that cause constant and random local sediment biomixing over short distances resulting in transport of sediment particles, analogous to molecular or eddy diffusion (from Kristensen et al., 2012). Includes epifaunal biodiffusers e.g. fiddler crabs; surficial biodiffusers e.g. Echinocardium; and gallery biodiffusers e.g. Nereis (Hediste) diversicolor.
Definition adapted from Kristensen et al., 2012. What is bioturbation? The need for a precise definition for fauna in aquatic sciences. MEPS 446: 285-302