Family Mangeliidae

Shell size to 6 The shell sculpture in this species comprises about 8-9 ribs on early whorls that increase in number to 12-15 on the last whorl of adult individuals. The microsculpture consists of fine spiral cords crossed by axial grooves. The shell may be cream-colored, often with groupings of spiral light-orange to golden-brown spiral bands. Do not confuse with Kurtziella limonitella, which has more shouldered, angulated whorls, with a sharper "bend" at the periphery. The shell in the image was collected by Lois Dunnam on Gulfside City Park Beach, on Sanibel, in 1996.

Shell size to 8 mm; shell turriform, strongly angled at the periphery of whorls, which imparts a "squarish" aspect to last whorl. Sculpture of 12-15 axial ribs per whorl and spiral cords crossed by axial, narrow lines. Spiral cords doubled at periphery. Outer lip thick in mature individuals. Color cream-white with brownish markings in the interstices between ribs, these markings stronger just below suture. All shells illustrated are from Sanibel Island. Supplementary images show (left) a shell with more pronounced sculpture, but with a damaged anterior canal, and (right) an immature (young) shell.

Shell size to 12 mm; shell turreted, angulate at periphery. Sculpture of 7-8 strongly angled ribs. Entire surface covered with fine spiral threads. Aperture less than 1/4 but larger than 1/5 of shell length. Color yellowish-white, or whitish at apex, changing to light-orange on body whorl.

Shell size to 6 Typically, the shell sculpture has a "frosted" aspect, with a sculpture of interrupted spiral microgrooves, and 15 larger axial ribs per whorl (but this number can vary). The species name alludes to the "double-cone" shape of the shell. The color is cream-white, with a broad light-brown spiral band at mid-whorl and another, narrower, just below suture. The shell in these images was collected in 1999 by Herb Chapin, near Beach Access number 6 off West Gulf Drive, on Sanibel.