Segmentina nitida

The shining ram's-horn snail, Segmentina nitida, is a species of minute, air-breathing, freshwater snail, an aquatic gastropod mollusk or micromollusk in the family Planorbidae, the ramshorn snails. The shell of this species is sinistral in coiling and almost planispiral in shape. The spire is deeply sunken. The surface of the shell is glossy. The maximum shell diameter is about 7 mm. This species lives in water weeds, in ponds and marsh drainage ditches. It is uncommon to rare.