Claus Nielsen

• Animal evolution
• Animal Evolution
• Animal Evolution
• Entoprocts
• Brachiopoda
• Entoproct life-cycles and the entoproct/ectoproct relationship
• Entoproct life-cycles and the entoproct/ectroproct relationship
• Fauna associated with the coral Porites from Phuket, Thailand
• New Middle and Late Anisian Ammonoid Faunas from Northwestern Nevada No. 52
• Notes on Littorina and Murex from the mangrove at Ao Nam-Bor, Phuket, Thailand