Now I've looked them up I've discovered that Aequidens are South, not Central American. It's amazing how long I thought that for.
Ignore my previous comment, I was considering it closest to a Port Acara, but don't know them well enough to ID positively, and for some reason had them out of region in my head.
Thank you Minnnt (please note I spelt your name right this time), for allowing me to learn a new thing today.