As Acmaea fonsecana Pilsbry & Lowe, 1932:
The shell is very shortly oval, the width about four-fifths of the length, conic, the apex erect, a little behind the anterior third of the length; slopes about straight. Color pale greenish to white, with numerous black or rusty blackish rays, generally the posterior ray flanked by two wider white wedges. Sculpture of delicate, separated riblets. Interior white, showing the dark rays through, with an irregular deep brown center, and tesselated border. Muscle scar rather indistinct. Length 15.4 mm., width 13 mm., height 6.5 mm. It resembles A. subrotundata Cpr., and A. pilosa Cpr., in sculpture, but is a much higher limpet. We cannot identify it with any of the dozen species of Acmaea described from the Panamic province. It has about the size and rounded outline of Patella nisoria Phil., from Chili, but that form appears to be related to Acmaea viridula. La Union, Gulf of Fonseca, Salvador (Lowe).