Boreal top
The boreal top or boreal top snail is species of minute, air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Valloniidae, and the sole species in the genus Zoogenetes.
Z. harpa occurs in the northern United States, across Canada, as well as in Scandinavia, the Swiss Alps, Russia, and Japan.
Description, habitat, and status
The boreal top snail is species of minute, air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Valloniidae. They are generally about in length as an adult. It is the sole species in the genus Zoogenetes.Its cone-shaped shell is reddish-brown, with ridges along the bottom spirals. Z. harpa is most active during fall and spring, when temperatures are more mild and moisture levels are higher. It lives on the bottom of logs and debris, often near or at the bottom of canyons with predominantly fir forests.
The snail is not considered generally endangered, though populations in some locations are considered threatened to varying degrees.