Sulcichnus sigillum Martinell & Domènech, 2009

Diagnosis.—Shallow groove parallel to the columella and bending 90 close to the calyx, to form a deeper, ring−shaped groove. Description.—Shallow grooves (1 mm maximum in depth) that run more or less in parallel to the axis of the columella from close to the base of the corallite. They turn a sharp 90 to the left when reaching a point a few millimetres from the edge of the calyx, where they deepen (to some 2 mm) and run almost the whole of the perimeter of the corallite, thus taking on the appearance of a branding iron.