Shell of medium size for the subgenus, sculptured postnuclear whorls 5.5, suture moderately impressed, periphery and base angulate, base weakly convex, broadly umbilicate, columella with 3 denticles at base, aperture oblique, circular within. The suture is laid just below the cord defining the base; on the penultimate whorl the shoulder area is nodular below the preceding suture; midway across the whorl there is a strong nodular peripheral cord, between the subsutural cord and the peripheral cord are 3 weakly defined cords with broader interspaces; between the peripheral cord and the basal cord are 3 more cords. Fine spiral striae may be observed under magnification throughout. Base with about 7 broadly spaced, low cords. Early whorls mottled with grayish-brown, later whorls predominately yellowish-tan with brown stripes radiating from the suture, terminating on the outer lip and on the basal lip nearly perpendicular to the lip edge. Columella and a broad area adjacent to the umbilicus white; umbilical wall and the callus tongue weakly tinted with green. Height, 13.4, diameter, 14.4 mm.

Tegula bergeroni has the proportions only of T. ligulata mariamadre Pilsbry & Lowe, 1932, which is not known south of Manzanillo, Mexico. It differs from the latter species in its smaller size and different color pattern. Tegula ligulata mariamadre never has green in the umbilical area. Most species of Tegula (Agathistoma) exhibiting the green callus tongue invariably show it, but some specimens of T. bergeroni do not, in others a trace of green may be discerned deep within the umbilical cavity. The species is named for Eugene Bergeron of Balboa, Canal Zone, Panama, collector of numerous examples of this species and donor to the Museum's collections.

Type Locality: Cabita Bay, near Cabo Corrientes, Colombia, 5° 29' 20" N, 77° 29' 35" W, inter-tidal, R/V Velero III station 229-34, 13 February 1934, 3 specimens.
Type Material: Holotype, LACM-AHF 1379; 1 paratype, LACM-AHF 1380: 1 paratype, USNM.
Referred Material: LACM 65-25, Tabogalsland, Panama, 5-15fathoms, 3 specimens; LACM B.368, Isla Senora, Perlas Islands, Panama, 8 specimens; AHF 239-34 and 859-38, Port Utria, Colombia, single specimens.