Dubia vs Pumila

Splitting clausilia dubia and c. pumila is notoriously hard, and there aren't many good photos on the internets anywhere, especially not of pumila. I'll try to put some helpful info here for my own use and convenience as much as for anybody else reading it.

My own comparison photos:

Photos by Aleksandr Anichtchenko, size not to scale:

Photos from a book by Digna Pilāte, no unambiguous attribution:

My own doodle with a summary, exaggerated:

This looks to be the case where the overall shape matters as well as the opening grooves - pumila seems noticeably longer and club-shaped, this is true.

Posted on July 9, 2023 03:49 PM by tasty_y