selenizone

English

Noun

selenizone (plural selenizones)

1. An anatomical structure in the shells of some families of sea snails, consisting of a spiral band of growth lines on the shell surface.
   • 1958, Ellis Leon Yochelson, Permian Gastropoda of the southwestern United States:

     The shapes are quite similar to the shape in Tapinotomaria, but their flat to convex selenizones are placed higher on the whorls and are located in the central portion of vertical whorl faces.

Further reading

• selenizone on Wikipedia.Wikipedia