Biafra Bight south to Angola, north to Cabo Verde archipelago, Canarias, Mediterranean. Grazer and micrograzer in the rocky gardens of the infralittoral. Original taxon: Patella nubecula. Shallow water on rocks, Málaga, Andalucia, S. Spain. 22mm.

« Shell conical, ovate-oblong, summit a little in front of the middle. Sculptured with numerous subobsolete, unequal radiating riblets. Grayish, with rays of dull purple. Fissure oblong, parallel-sided, its breadth two-fifths of its length. Inside white or bluish-white inside the muscle-impression, the rest of a delicate green shade. Hole-callus white or green, bounded by a brown line, which is often obsolete. Margin acute, a little crenulated. » – H. A. Pilsbry: op. cit. p.170.

« The typical form is oblong, narrower in front, altitude not quite a half of the breadth; fissure oblong, about one-seventh the length of the shell; inside colored as above described, the muscle impression rather distant from the margin (in this respect differing from the South African species mutabilis and incarnata, which have the impression near the margin), and the scar is narrow, generally deeply impressed. The riblets of the outer surface are low, rounded, obtuse, often subobsolete. » – H. A. Pilsbry: op. cit. p.170.

« The only Mediterranean species of true Fissurella, the others belonging to the genus Glyphis. It is rather variable in color and form, but is constantly separated from the West Indian F. rosea by the decidedly larger perforation and more obsolete ribbing. The similar South African species have the muscle-impression much nearer to the margin than it is in this form. » – H. A. Pilsbry: op. cit. p.171.