Terebelliformia, annelids with multiple grooved palps, is currently comprised of the following family-ranked taxa:

Alvinellidae

Ampharetidae

Pectinariidae

Terebellidae

Trichobranchidae

The group contains taxa with fxed segment numbers (e.g. Pectinariidae) or fixed numbers of segments in certain areas (e.g the thorax). We are investigating the monophyly of the resepctive families and the evolution of features such as segmentation paeterns.