Trivia experts!
I've got a 20mm Trivia from Nosara, Costa Rica, that looks similar to T.
radians Lamarck. But this might be a distinctive form.
It's subcircular in outline. And it is squashed down dorso-ventrally (less
than 11mm across) with a hump in the center. Looks like a thick button.
I can send jpgs for anyone interested.
David Kirsh
Durham, NC