Conus gypsus (Olsson, 1964)

A cone of small or medium size, rather slender, solid, the high, conic spire composed of eight plus whorls in the type, the small, apical ones missing. The whorls are shouldred by the angled edge of the subsutural fasciole which is relatively wide, flat, or a little concave, marked with the rather coarse shallowly concave-shaped growth lines of the anal sinus and a few subobsolete spirals. On the earlier spire whorls, the edge of the shoulder projects a little above the suture and is neatly coronated by small nodes, the shoulder angle on the later whorls becoming plain. The body whorl is large and forms most of the shell, shaped like a narrow inverted funnel, its upper surface smooth and polished, its lower half sculptured with pitted incised spirals forming between them, wide, flat, spiral ribbons, the incised spirals becoming grooves below and the spiral ribbons narrower and higher. In small shells, the spiral sculpture covers the whole surface to the shoulder. The outer lip is thin, straight, the anal sinus above shallow, almost straight across.

Length 31.1 mm., greater diameter 13.2 mm. Holotype, USNM 643933.

Esmeraldas formations: Punta Gorda.

Conus gypsus

Plate 12, fig. 6

Holotype 643933

mm. 31,1 x 13,2

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Bibliografia Consultata

· (1) - Olsson, A. A., 1964. Neogene Mollusks from Northwestern Ecuador

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