Abstract
Thirty one species of marine gastrotrich are listed from 13 sand-beach and tidal flat sites on the Isles of Scilly, UK, and their distribution is described. Several species occurred at higher levels on the shore than they do on the mainland. Considered in relation to coastal exposure, the species richness for the chaetonotids and total gastrotrichs was significantly lower than mainland sites, but this was not the case for macrodasyids.