"Shell small thin, translucent white, compressed, having a marked 'Camptonectes’ striation, beside about thirty-six radial rows of minute, elevated, granulelike scales, very easily detached and more crowded near the middle of the base; hinge line straight, anterior ear in the right valve long, prominent, with five radial rows of scales and obvious concentric striation; byssal notch deep and wide, with a broad fasciole, the ctenolium with three free teeth; posterior ear not differentiated by a notch; profile of the valve, below and behind, a segment of a circle; interior with glassy polish, scar small and high up, hardly visible; margins entire; ligamentary pit small, shallow." (fide Dali, 1908) Size: Normal adult size range is 8 to 12 mm

Only known from the Galapagos Islands and southern Chile.
Habitat: Deep water, on sandy bottoms.