A new species of Sabellinae (Sabellidae), Amphicorina triangulata, is described. This species is characterized by the shape of the collar (triangular and strongly reduced), by having four pair of radioles and one pair of ventral filaments in the branchial crown, six abdominal segments in adult specimens, and by the shape of ventral thoracic notochaetae and abdominal uncini. The material was collected from different substrata on rocky bottoms in the Chafarinas Islands (SW Mediterranean).