Calliostoma scalenum Quinn, 1992 reaches about 40 mm in height, and has a moderately narrow spire angle. The shell sculpture consists of finely beaded spiral cords that are intercalated with alternating narrower threads in the last shell whorls. There is a relatively large number of cords on the shell base, the umbilicus is relatively small, umbilicus wall white, bordered by a couple of larger beaded cords. The shell color is light-brown, with a pattern of whitish crescent-shaped spots on the whorl sides. This shell was donated to the National Shell Museum collection by Kevan and Linda Sunderland of Sunrise, Florida.
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