Why yes, that is an Ankylosaurus with a howdah mounted Flakverling-20 on it. This beautiful model, known as the Flakasaurus, is going to be available at Historicon next week from Eureka Miniatures. They have a growing line of Jurassic Reich figures, including Nazis riding Deinonychus, leading a pack of Velociraptors, and flying on Stukasaurus, a Pterosaur.
I bought some of the Stukasaurus last year to add to my German VSF forces on Venus. Haven't done anything with them yet, but I might be moving them up the priority list soon.