Ammonite Pinwheel Snail  |  

Discocharopa vigens, Family Charopidae, is a tiny, flat land snail. Adult specimens usually have between 3.6 and 3.9 whorls and are 2.5–3.0 mm wide, but some specimens are larger. The species has a very wide umbilicus (the axially aligned hollow cone around which the whorls of the shell are coiled) which is 30–40 per cent of shell width. The spire (the upper convoluted, or whorled, part of the shell) is loosely coiled. The protoconch (the embryonic shell or apex of the shell) is dominated by strong radial riblets. The shell is uniformly pale greyish-white or yellow-grey in colour.