Choanoflagellate orders

Acanthoecida is an order of Choanoflagellates belonging to the class Choanoflagellatea. It is a type of heterotrophic nanoflagellate that feeds on suspended particles.

Craspedida is an order of choanoflagellate, with members with an exclusively organic covering. Crown group craspedids (and perhaps crown group choanoflagellates if Acanthoecida arose within Craspedida) appeared 422.78 million years ago. Although a previous study from 2017 recovered the divergence of the crown group choanoflagellates (craspedids) at 786.62 million years.