Fig. 1

Typical intertidal habitats of Cingula trifasciata. a Enclosed gravel/boulder areas, protected from wave action; photo at Fajã da Caldeira de Santo Cristo (São Jorge Island, Azores) by Sérgio P. Ávila; b In the algal turf; photo at Horta (Faial Island, Azores) by Lara Baptista. Permission to publish these images was granted by the photographers and people displayed in them