Fig. 2: Evolutionary tree of the Ophiuroidea to show the position of Ophiopetagno paicei and Muldaster haakei from the Silurian of Gotland, Sweden.
From: Miniaturization during a Silurian environmental crisis generated the modern brittle star body plan
Arrows indicate synapomorphies at the respective nodes. DAP dorsal arm plate, LAP lateral arm plate, VWC water vessel canal, Ceno. Cenozoic, Meso. Mesozoic. Gray lines indicate documented fossil range of taxa.
