Disiapoda

Disiapoda is a clade of animals on Rilloria that has is one of the initial creatures to develop on the planet. This clade is home to the insect equivalent of the planet. Early animals in this clade were radial symmetric, benthic dwellers feeding on primarily crystallo-algae around the Spell Stone lines. Some later species would develop bilateral symmetry when they ventured onto dry land. 
The earliest example of this clade is Harenea disia. This species looked very much like a blobby starfish and lived like them. Moving slowly across the ocean flow, munching on the mats of crystallo-algae. This species has since gone extinct, but is a great example of ancient disiapoda.