The “orange spot” (Zonitoides nitidus) revisted

Black Gloss, Orange Spot

In in earlier post, I mentioned how the black-bodied Zonitoides nitidus (common name: Black Gloss) has an orange-coloured spot that is visible through the translucent shell (although apparently not always that orange but more yellowish). In the photograph I included at the time, this spot was just barely visible if one knows where to look. Here I add another photograph, showing this character much more clearly (and with a giant arrow to point it out).

Zonitoides nitidus. Lundar Beach Provincial Park (E shore of Lake Manitoba), Manitoba.