What is a PRIME estimate?

If several estimates for a species have been published or communicated, then one PRIME estimate has been identified as the estimate preferred to any other for that species.

Searching for Prime estimates

Using this search option will return just the prime estimate for each species if more than one C-value estimate is available.

Searching for All estimates

Using this option will return all available C-value estimates for a species. The prime estimate of the species is identified in the 'Prime' column on the Results page.