The Echinoid Directory

• Home
• Introduction
• Morphology
• Keys
• Classification
• 3D models
• Index to taxa
• Glossary
• Log in

Mesodiadema marconissae (Desor, 1856). Museum d'Histoire Naturelle, Geneva, de Loriol Collection 25958. Lower Pliensbachian, Lower Jurassic, Grotto di San Eustachio, near Camerino, Tuscany, Italy. Lateral view.

Diameter of specimen 17.5 mm.