| Thresherodiscus ramosus Edrioasteroid Bobcaygeon Formation Brechin, Ontario, Canada One of the rarest edrioasteroids from this locality. This specimen split when the hardground it was on, broke and settled. Size: 2 cm diameter | 
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| Thresherodiscus ramosus Edrioasteroid Bobcaygeon Formation Brechin, Ontario, Canada One of the rarest edrioasteroids from this locality. This specimen split when the hardground it was on, broke and settled. Size: 2 cm diameter |
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