The Poweshiek Skipper Project

Terrestrial Snails


 Zonitoides nitidus (O.F. Müller, 1774)

Black gloss

This snail is also known as Hylaina nitida and Zonites nitidus.  It is found in the northern Midwestern states--mostly those that border the great lakes, but also including Iowa.

These snails were thick in a muddy area near Clear Lake, Iowa.  They were on saturated logs on the wetland areas around the lake.

Superficially they resemble the more common Z. arboreus, although they are somewhat larger and they lack the distinct whitish lower part to the foot.


The umbilicus of Z. nitidus is slightly wider than that of Z. arboreus, being about 1/5 the width of the shell compared to 1/6th the width for Z. arboreus.