Worms build heavy sandy tubes which are closed by an operculum of golden-coloured setae originating from the first 3 setigers. There are numerous buccal cirri and a pair of small grooved palps around the mouth. Body in 3 sections the last of which is an asetigerous tube. The thorax is rudimentary. The median region has capillary neurosetae and pectinate uncinae dorsally.