Reduction in the number of Early Cambrian helicoplacoid species

B. C. Wilbur

2006

Article

Palaeoworld 15:283-293

Find it at:

http://dx.doi.org/10.1016/j.palwor.2006.10.009

Taxa discussed in this work:

• Helicoplacidae
• Helicoplacus gilberti
• Polyplacus kilmeri
• Waucobella
• Waucobella nelsoni

Taxonomy:

• Helicoplacus gilberti belongs to Helicoplacus - Durham and Caster (1963)
• Waucobella nelsoni belongs to Waucobella - Durham (1963)
• Polyplacus kilmeri belongs to Polyplacus - Durham and Caster (1963)
• Helicoplacidae belongs to Helicoplacoidea - Wilbur (2006)
• Helicoplacus belongs to Helicoplacidae - Wilbur (2006)
• Waucobella belongs to Helicoplacidae - Wilbur (2006)
• Polyplacus belongs to Helicoplacidae - Wilbur (2006)