The Heliomonadida[1] (formerly Dimorphida[2]) are a small group of heliozoan amoeboids that are unusual in possessing flagella throughout their life cycle.

Genetic studies place them among the Cercozoa, a group including various other flagellates that form filose pseudopodia.

This order has recently been placed into the new class of naked filose cercozoans called Granofilosea.

[1] There are two genera in this order: Bundles of microtubules, typically in square array, arise from a body near the flagellar bases and support the numerous axopods that project from the cell surface.

Dimorphids have a single nucleus, and mitochondria with tubular cristae.