A follow up to sighting 4377210. The images show tiny insects on a slug which appear to be two distinct types, one white and smaller than the larger coloured ones. These are possibly Riccardoella oudemansi, white slug mites. (They have a very similar body shape to red velvet mites). The insects were seen entering and leaving the pneumostome as well as riding on the slug's underside. They also moved around the slug's body at great speed.