Belongs within: Echinodermata. The Cyclocystoidea are a Middle Cambrian to Middle Devonian group of flattened echinoderms with a disc-shaped body lacking arms or other appendages. The lifestyle of cyclocystoids remains uncertain, though they may have taken organic matter off their substrate (Glass et al. 2003). Characters (from Ubaghs 1978): Disk-shaped body with submarginal frame of… Continue reading Cyclocystoidea